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Finding the Fourth Proportional to 708.38, 1,059.63 and 640.88

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Solution

The fourth proportional to 708.38, 1,059.63 and 640.88 is: 958.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.38 : 1,059.63 = 640.88 : x
  2. Step 2: Convert to fraction form
    708.38/1,059.63 = 640.88/x
  3. Step 3: Cross multiply
    708.38x = 1,059.63 × 640.88
  4. Step 4: Simplify right side
    708.38x = 679,095.67
  5. Step 5: Solve for x
    x = 679,095.67/708.38
  6. Step 6: Final answer
    x = 958.66

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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.