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Finding the Fourth Proportional to 100,691.74, 138,919.99 and 62,437.51

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Solution

The fourth proportional to 100,691.74, 138,919.99 and 62,437.51 is: 86,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,691.74 : 138,919.99 = 62,437.51 : x
  2. Step 2: Convert to fraction form
    100,691.74/138,919.99 = 62,437.51/x
  3. Step 3: Cross multiply
    100,691.74x = 138,919.99 × 62,437.51
  4. Step 4: Simplify right side
    100,691.74x = 8,673,818,264.82
  5. Step 5: Solve for x
    x = 8,673,818,264.82/100,691.74
  6. Step 6: Final answer
    x = 86,142.30

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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.