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Finding the Fourth Proportional to 38,687.78, 53,389.95 and 21,920.78

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Solution

The fourth proportional to 38,687.78, 53,389.95 and 21,920.78 is: 30,251.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,687.78 : 53,389.95 = 21,920.78 : x
  2. Step 2: Convert to fraction form
    38,687.78/53,389.95 = 21,920.78/x
  3. Step 3: Cross multiply
    38,687.78x = 53,389.95 × 21,920.78
  4. Step 4: Simplify right side
    38,687.78x = 1,170,349,348.16
  5. Step 5: Solve for x
    x = 1,170,349,348.16/38,687.78
  6. Step 6: Final answer
    x = 30,251.14

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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.