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Finding the Fourth Proportional to 708.45, 1,061.71 and 318.57

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Solution

The fourth proportional to 708.45, 1,061.71 and 318.57 is: 477.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.45 : 1,061.71 = 318.57 : x
  2. Step 2: Convert to fraction form
    708.45/1,061.71 = 318.57/x
  3. Step 3: Cross multiply
    708.45x = 1,061.71 × 318.57
  4. Step 4: Simplify right side
    708.45x = 338,228.95
  5. Step 5: Solve for x
    x = 338,228.95/708.45
  6. Step 6: Final answer
    x = 477.42

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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.