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Finding the Fourth Proportional to 28,266.70, 42,400.05 and 7,490.20

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Solution

The fourth proportional to 28,266.70, 42,400.05 and 7,490.20 is: 11,235.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,266.70 : 42,400.05 = 7,490.20 : x
  2. Step 2: Convert to fraction form
    28,266.70/42,400.05 = 7,490.20/x
  3. Step 3: Cross multiply
    28,266.70x = 42,400.05 × 7,490.20
  4. Step 4: Simplify right side
    28,266.70x = 317,584,854.51
  5. Step 5: Solve for x
    x = 317,584,854.51/28,266.70
  6. Step 6: Final answer
    x = 11,235.30

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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.