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Finding the Fourth Proportional to 100.47, 138.62 and 59.03

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Solution

The fourth proportional to 100.47, 138.62 and 59.03 is: 81.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.47 : 138.62 = 59.03 : x
  2. Step 2: Convert to fraction form
    100.47/138.62 = 59.03/x
  3. Step 3: Cross multiply
    100.47x = 138.62 × 59.03
  4. Step 4: Simplify right side
    100.47x = 8,182.71
  5. Step 5: Solve for x
    x = 8,182.71/100.47
  6. Step 6: Final answer
    x = 81.44

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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.