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Finding the Fourth Proportional to 100.20, 149.27 and 97.80

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Solution

The fourth proportional to 100.20, 149.27 and 97.80 is: 145.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.20 : 149.27 = 97.80 : x
  2. Step 2: Convert to fraction form
    100.20/149.27 = 97.80/x
  3. Step 3: Cross multiply
    100.20x = 149.27 × 97.80
  4. Step 4: Simplify right side
    100.20x = 14,598.12
  5. Step 5: Solve for x
    x = 14,598.12/100.20
  6. Step 6: Final answer
    x = 145.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.