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Finding the Fourth Proportional to 87.03, 119.93 and 72.45

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Solution

The fourth proportional to 87.03, 119.93 and 72.45 is: 99.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.03 : 119.93 = 72.45 : x
  2. Step 2: Convert to fraction form
    87.03/119.93 = 72.45/x
  3. Step 3: Cross multiply
    87.03x = 119.93 × 72.45
  4. Step 4: Simplify right side
    87.03x = 8,688.57
  5. Step 5: Solve for x
    x = 8,688.57/87.03
  6. Step 6: Final answer
    x = 99.83

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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.