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Finding the Fourth Proportional to 100,387.84, 138,530.82 and 60,124

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Solution

The fourth proportional to 100,387.84, 138,530.82 and 60,124 is: 82,968.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,387.84 : 138,530.82 = 60,124 : x
  2. Step 2: Convert to fraction form
    100,387.84/138,530.82 = 60,124/x
  3. Step 3: Cross multiply
    100,387.84x = 138,530.82 × 60,124
  4. Step 4: Simplify right side
    100,387.84x = 8,329,027,021.68
  5. Step 5: Solve for x
    x = 8,329,027,021.68/100,387.84
  6. Step 6: Final answer
    x = 82,968.49

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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.