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Finding the Fourth Proportional to 39,478.16, 54,478.90 and 21,572.70

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Solution

The fourth proportional to 39,478.16, 54,478.90 and 21,572.70 is: 29,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,478.16 : 54,478.90 = 21,572.70 : x
  2. Step 2: Convert to fraction form
    39,478.16/54,478.90 = 21,572.70/x
  3. Step 3: Cross multiply
    39,478.16x = 54,478.90 × 21,572.70
  4. Step 4: Simplify right side
    39,478.16x = 1,175,256,966.03
  5. Step 5: Solve for x
    x = 1,175,256,966.03/39,478.16
  6. Step 6: Final answer
    x = 29,769.80

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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.