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Finding the Fourth Proportional to 1,007.20, 1,389.12 and 658.24

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Solution

The fourth proportional to 1,007.20, 1,389.12 and 658.24 is: 907.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.20 : 1,389.12 = 658.24 : x
  2. Step 2: Convert to fraction form
    1,007.20/1,389.12 = 658.24/x
  3. Step 3: Cross multiply
    1,007.20x = 1,389.12 × 658.24
  4. Step 4: Simplify right side
    1,007.20x = 914,374.35
  5. Step 5: Solve for x
    x = 914,374.35/1,007.20
  6. Step 6: Final answer
    x = 907.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.