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Finding the Fourth Proportional to 100.04, 138.07 and 72.40

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Solution

The fourth proportional to 100.04, 138.07 and 72.40 is: 99.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.04 : 138.07 = 72.40 : x
  2. Step 2: Convert to fraction form
    100.04/138.07 = 72.40/x
  3. Step 3: Cross multiply
    100.04x = 138.07 × 72.40
  4. Step 4: Simplify right side
    100.04x = 9,996.27
  5. Step 5: Solve for x
    x = 9,996.27/100.04
  6. Step 6: Final answer
    x = 99.92

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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.