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Finding the Fourth Proportional to 157.52, 235.79 and 99.80

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Solution

The fourth proportional to 157.52, 235.79 and 99.80 is: 149.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.52 : 235.79 = 99.80 : x
  2. Step 2: Convert to fraction form
    157.52/235.79 = 99.80/x
  3. Step 3: Cross multiply
    157.52x = 235.79 × 99.80
  4. Step 4: Simplify right side
    157.52x = 23,531.84
  5. Step 5: Solve for x
    x = 23,531.84/157.52
  6. Step 6: Final answer
    x = 149.39

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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.