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Finding the Fourth Proportional to 157.30, 217.08 and 87.35

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Solution

The fourth proportional to 157.30, 217.08 and 87.35 is: 120.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.30 : 217.08 = 87.35 : x
  2. Step 2: Convert to fraction form
    157.30/217.08 = 87.35/x
  3. Step 3: Cross multiply
    157.30x = 217.08 × 87.35
  4. Step 4: Simplify right side
    157.30x = 18,961.50
  5. Step 5: Solve for x
    x = 18,961.50/157.30
  6. Step 6: Final answer
    x = 120.55

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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.