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Finding the Fourth Proportional to 157.10, 216.72 and 98.90

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Solution

The fourth proportional to 157.10, 216.72 and 98.90 is: 136.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.10 : 216.72 = 98.90 : x
  2. Step 2: Convert to fraction form
    157.10/216.72 = 98.90/x
  3. Step 3: Cross multiply
    157.10x = 216.72 × 98.90
  4. Step 4: Simplify right side
    157.10x = 21,433.61
  5. Step 5: Solve for x
    x = 21,433.61/157.10
  6. Step 6: Final answer
    x = 136.43

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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.