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Finding the Fourth Proportional to 157.56, 217.47 and 98.58

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Solution

The fourth proportional to 157.56, 217.47 and 98.58 is: 136.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.56 : 217.47 = 98.58 : x
  2. Step 2: Convert to fraction form
    157.56/217.47 = 98.58/x
  3. Step 3: Cross multiply
    157.56x = 217.47 × 98.58
  4. Step 4: Simplify right side
    157.56x = 21,438.19
  5. Step 5: Solve for x
    x = 21,438.19/157.56
  6. Step 6: Final answer
    x = 136.06

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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.