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Finding the Fourth Proportional to 758.38, 1,047.25 and 479.11

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Solution

The fourth proportional to 758.38, 1,047.25 and 479.11 is: 661.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.38 : 1,047.25 = 479.11 : x
  2. Step 2: Convert to fraction form
    758.38/1,047.25 = 479.11/x
  3. Step 3: Cross multiply
    758.38x = 1,047.25 × 479.11
  4. Step 4: Simplify right side
    758.38x = 501,747.95
  5. Step 5: Solve for x
    x = 501,747.95/758.38
  6. Step 6: Final answer
    x = 661.60

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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.