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Finding the Fourth Proportional to 65,246.60, 90,038.78 and 38,390.85

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Solution

The fourth proportional to 65,246.60, 90,038.78 and 38,390.85 is: 52,978.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,246.60 : 90,038.78 = 38,390.85 : x
  2. Step 2: Convert to fraction form
    65,246.60/90,038.78 = 38,390.85/x
  3. Step 3: Cross multiply
    65,246.60x = 90,038.78 × 38,390.85
  4. Step 4: Simplify right side
    65,246.60x = 3,456,665,164.76
  5. Step 5: Solve for x
    x = 3,456,665,164.76/65,246.60
  6. Step 6: Final answer
    x = 52,978.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.