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Finding the Fourth Proportional to 758.52, 1,047.42 and 479.25

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Solution

The fourth proportional to 758.52, 1,047.42 and 479.25 is: 661.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.52 : 1,047.42 = 479.25 : x
  2. Step 2: Convert to fraction form
    758.52/1,047.42 = 479.25/x
  3. Step 3: Cross multiply
    758.52x = 1,047.42 × 479.25
  4. Step 4: Simplify right side
    758.52x = 501,976.04
  5. Step 5: Solve for x
    x = 501,976.04/758.52
  6. Step 6: Final answer
    x = 661.78

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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.