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Finding the Fourth Proportional to 101.43, 151.45 and 86.20

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Solution

The fourth proportional to 101.43, 151.45 and 86.20 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.43 : 151.45 = 86.20 : x
  2. Step 2: Convert to fraction form
    101.43/151.45 = 86.20/x
  3. Step 3: Cross multiply
    101.43x = 151.45 × 86.20
  4. Step 4: Simplify right side
    101.43x = 13,054.40
  5. Step 5: Solve for x
    x = 13,054.40/101.43
  6. Step 6: Final answer
    x = 128.70

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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.