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Finding the Fourth Proportional to 713.30, 1,067.88 and 438.57

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Solution

The fourth proportional to 713.30, 1,067.88 and 438.57 is: 656.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.30 : 1,067.88 = 438.57 : x
  2. Step 2: Convert to fraction form
    713.30/1,067.88 = 438.57/x
  3. Step 3: Cross multiply
    713.30x = 1,067.88 × 438.57
  4. Step 4: Simplify right side
    713.30x = 468,341.78
  5. Step 5: Solve for x
    x = 468,341.78/713.30
  6. Step 6: Final answer
    x = 656.59

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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.