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Finding the Fourth Proportional to 100,681.20, 138,929.22 and 58,231.44

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Solution

The fourth proportional to 100,681.20, 138,929.22 and 58,231.44 is: 80,353.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,681.20 : 138,929.22 = 58,231.44 : x
  2. Step 2: Convert to fraction form
    100,681.20/138,929.22 = 58,231.44/x
  3. Step 3: Cross multiply
    100,681.20x = 138,929.22 × 58,231.44
  4. Step 4: Simplify right side
    100,681.20x = 8,090,048,538.68
  5. Step 5: Solve for x
    x = 8,090,048,538.68/100,681.20
  6. Step 6: Final answer
    x = 80,353.12

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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.