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Finding the Fourth Proportional to 157.20, 216.70 and 98.88

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Solution

The fourth proportional to 157.20, 216.70 and 98.88 is: 136.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.20 : 216.70 = 98.88 : x
  2. Step 2: Convert to fraction form
    157.20/216.70 = 98.88/x
  3. Step 3: Cross multiply
    157.20x = 216.70 × 98.88
  4. Step 4: Simplify right side
    157.20x = 21,427.30
  5. Step 5: Solve for x
    x = 21,427.30/157.20
  6. Step 6: Final answer
    x = 136.31

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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.