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Finding the Fourth Proportional to 715.18, 1,071.33 and 426.46

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Solution

The fourth proportional to 715.18, 1,071.33 and 426.46 is: 638.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.18 : 1,071.33 = 426.46 : x
  2. Step 2: Convert to fraction form
    715.18/1,071.33 = 426.46/x
  3. Step 3: Cross multiply
    715.18x = 1,071.33 × 426.46
  4. Step 4: Simplify right side
    715.18x = 456,879.39
  5. Step 5: Solve for x
    x = 456,879.39/715.18
  6. Step 6: Final answer
    x = 638.83

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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.