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Finding the Fourth Proportional to 157.65, 217.56 and 87.70

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Solution

The fourth proportional to 157.65, 217.56 and 87.70 is: 121.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.65 : 217.56 = 87.70 : x
  2. Step 2: Convert to fraction form
    157.65/217.56 = 87.70/x
  3. Step 3: Cross multiply
    157.65x = 217.56 × 87.70
  4. Step 4: Simplify right side
    157.65x = 19,080.01
  5. Step 5: Solve for x
    x = 19,080.01/157.65
  6. Step 6: Final answer
    x = 121.03

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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.