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Finding the Fourth Proportional to 157.26, 235.50 and 99.31

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Solution

The fourth proportional to 157.26, 235.50 and 99.31 is: 148.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.26 : 235.50 = 99.31 : x
  2. Step 2: Convert to fraction form
    157.26/235.50 = 99.31/x
  3. Step 3: Cross multiply
    157.26x = 235.50 × 99.31
  4. Step 4: Simplify right side
    157.26x = 23,387.36
  5. Step 5: Solve for x
    x = 23,387.36/157.26
  6. Step 6: Final answer
    x = 148.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.