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Finding the Fourth Proportional to 100.98, 151.47 and 85.05

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Solution

The fourth proportional to 100.98, 151.47 and 85.05 is: 127.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.98 : 151.47 = 85.05 : x
  2. Step 2: Convert to fraction form
    100.98/151.47 = 85.05/x
  3. Step 3: Cross multiply
    100.98x = 151.47 × 85.05
  4. Step 4: Simplify right side
    100.98x = 12,882.52
  5. Step 5: Solve for x
    x = 12,882.52/100.98
  6. Step 6: Final answer
    x = 127.58

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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.