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Finding the Fourth Proportional to 157.12, 216.80 and 87.17

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Solution

The fourth proportional to 157.12, 216.80 and 87.17 is: 120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.12 : 216.80 = 87.17 : x
  2. Step 2: Convert to fraction form
    157.12/216.80 = 87.17/x
  3. Step 3: Cross multiply
    157.12x = 216.80 × 87.17
  4. Step 4: Simplify right side
    157.12x = 18,898.46
  5. Step 5: Solve for x
    x = 18,898.46/157.12
  6. Step 6: Final answer
    x = 120.28

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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.