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Finding the Fourth Proportional to 1,388.66, 2,084.02 and 658.24

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Solution

The fourth proportional to 1,388.66, 2,084.02 and 658.24 is: 987.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.66 : 2,084.02 = 658.24 : x
  2. Step 2: Convert to fraction form
    1,388.66/2,084.02 = 658.24/x
  3. Step 3: Cross multiply
    1,388.66x = 2,084.02 × 658.24
  4. Step 4: Simplify right side
    1,388.66x = 1,371,785.32
  5. Step 5: Solve for x
    x = 1,371,785.32/1,388.66
  6. Step 6: Final answer
    x = 987.85

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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.