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Finding the Fourth Proportional to 39,478.16, 54,478.90 and 21,572.71

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Solution

The fourth proportional to 39,478.16, 54,478.90 and 21,572.71 is: 29,769.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,478.16 : 54,478.90 = 21,572.71 : x
  2. Step 2: Convert to fraction form
    39,478.16/54,478.90 = 21,572.71/x
  3. Step 3: Cross multiply
    39,478.16x = 54,478.90 × 21,572.71
  4. Step 4: Simplify right side
    39,478.16x = 1,175,257,510.82
  5. Step 5: Solve for x
    x = 1,175,257,510.82/39,478.16
  6. Step 6: Final answer
    x = 29,769.81

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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.