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Finding the Fourth Proportional to 173.47, 239.28 and 99.77

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Solution

The fourth proportional to 173.47, 239.28 and 99.77 is: 137.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.47 : 239.28 = 99.77 : x
  2. Step 2: Convert to fraction form
    173.47/239.28 = 99.77/x
  3. Step 3: Cross multiply
    173.47x = 239.28 × 99.77
  4. Step 4: Simplify right side
    173.47x = 23,872.97
  5. Step 5: Solve for x
    x = 23,872.97/173.47
  6. Step 6: Final answer
    x = 137.62

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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.