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Finding the Fourth Proportional to 100,507.69, 138,690.79 and 58,065.31

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Solution

The fourth proportional to 100,507.69, 138,690.79 and 58,065.31 is: 80,124.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,507.69 : 138,690.79 = 58,065.31 : x
  2. Step 2: Convert to fraction form
    100,507.69/138,690.79 = 58,065.31/x
  3. Step 3: Cross multiply
    100,507.69x = 138,690.79 × 58,065.31
  4. Step 4: Simplify right side
    100,507.69x = 8,053,123,715.49
  5. Step 5: Solve for x
    x = 8,053,123,715.49/100,507.69
  6. Step 6: Final answer
    x = 80,124.45

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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.