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Finding the Fourth Proportional to 90,745.64, 136,118.46 and 28,421

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Solution

The fourth proportional to 90,745.64, 136,118.46 and 28,421 is: 42,631.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,745.64 : 136,118.46 = 28,421 : x
  2. Step 2: Convert to fraction form
    90,745.64/136,118.46 = 28,421/x
  3. Step 3: Cross multiply
    90,745.64x = 136,118.46 × 28,421
  4. Step 4: Simplify right side
    90,745.64x = 3,868,622,751.66
  5. Step 5: Solve for x
    x = 3,868,622,751.66/90,745.64
  6. Step 6: Final answer
    x = 42,631.50

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.