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Finding the Fourth Proportional to 38,929, 53,722.02 and 21,265

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Solution

The fourth proportional to 38,929, 53,722.02 and 21,265 is: 29,345.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,929 : 53,722.02 = 21,265 : x
  2. Step 2: Convert to fraction form
    38,929/53,722.02 = 21,265/x
  3. Step 3: Cross multiply
    38,929x = 53,722.02 × 21,265
  4. Step 4: Simplify right side
    38,929x = 1,142,398,755.30
  5. Step 5: Solve for x
    x = 1,142,398,755.30/38,929
  6. Step 6: Final answer
    x = 29,345.70

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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.