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Finding the Fourth Proportional to 31,377, 43,304.10 and 18,129

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Solution

The fourth proportional to 31,377, 43,304.10 and 18,129 is: 25,020.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,377 : 43,304.10 = 18,129 : x
  2. Step 2: Convert to fraction form
    31,377/43,304.10 = 18,129/x
  3. Step 3: Cross multiply
    31,377x = 43,304.10 × 18,129
  4. Step 4: Simplify right side
    31,377x = 785,060,028.90
  5. Step 5: Solve for x
    x = 785,060,028.90/31,377
  6. Step 6: Final answer
    x = 25,020.24

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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.