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Finding the Fourth Proportional to 38,672.17, 53,369.70 and 21,681.87

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Solution

The fourth proportional to 38,672.17, 53,369.70 and 21,681.87 is: 29,922.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,672.17 : 53,369.70 = 21,681.87 : x
  2. Step 2: Convert to fraction form
    38,672.17/53,369.70 = 21,681.87/x
  3. Step 3: Cross multiply
    38,672.17x = 53,369.70 × 21,681.87
  4. Step 4: Simplify right side
    38,672.17x = 1,157,154,630.49
  5. Step 5: Solve for x
    x = 1,157,154,630.49/38,672.17
  6. Step 6: Final answer
    x = 29,922.15

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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.