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Finding the Fourth Proportional to 713.48, 1,068.14 and 438.74

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Solution

The fourth proportional to 713.48, 1,068.14 and 438.74 is: 656.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.48 : 1,068.14 = 438.74 : x
  2. Step 2: Convert to fraction form
    713.48/1,068.14 = 438.74/x
  3. Step 3: Cross multiply
    713.48x = 1,068.14 × 438.74
  4. Step 4: Simplify right side
    713.48x = 468,635.74
  5. Step 5: Solve for x
    x = 468,635.74/713.48
  6. Step 6: Final answer
    x = 656.83

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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.