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Finding the Fourth Proportional to 708.70, 1,063.32 and 318.59

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Solution

The fourth proportional to 708.70, 1,063.32 and 318.59 is: 478.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.70 : 1,063.32 = 318.59 : x
  2. Step 2: Convert to fraction form
    708.70/1,063.32 = 318.59/x
  3. Step 3: Cross multiply
    708.70x = 1,063.32 × 318.59
  4. Step 4: Simplify right side
    708.70x = 338,763.12
  5. Step 5: Solve for x
    x = 338,763.12/708.70
  6. Step 6: Final answer
    x = 478.01

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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.