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Finding the Fourth Proportional to 153.49, 230.18 and 66.80

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Solution

The fourth proportional to 153.49, 230.18 and 66.80 is: 100.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.49 : 230.18 = 66.80 : x
  2. Step 2: Convert to fraction form
    153.49/230.18 = 66.80/x
  3. Step 3: Cross multiply
    153.49x = 230.18 × 66.80
  4. Step 4: Simplify right side
    153.49x = 15,374.92
  5. Step 5: Solve for x
    x = 15,374.92/153.49
  6. Step 6: Final answer
    x = 100.17

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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.