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Finding the Fourth Proportional to 708.77, 1,063.41 and 318.74

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Solution

The fourth proportional to 708.77, 1,063.41 and 318.74 is: 478.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.77 : 1,063.41 = 318.74 : x
  2. Step 2: Convert to fraction form
    708.77/1,063.41 = 318.74/x
  3. Step 3: Cross multiply
    708.77x = 1,063.41 × 318.74
  4. Step 4: Simplify right side
    708.77x = 338,946.58
  5. Step 5: Solve for x
    x = 338,946.58/708.77
  6. Step 6: Final answer
    x = 478.22

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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.