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Finding the Fourth Proportional to 708.96, 1,061.12 and 641.62

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Solution

The fourth proportional to 708.96, 1,061.12 and 641.62 is: 960.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.96 : 1,061.12 = 641.62 : x
  2. Step 2: Convert to fraction form
    708.96/1,061.12 = 641.62/x
  3. Step 3: Cross multiply
    708.96x = 1,061.12 × 641.62
  4. Step 4: Simplify right side
    708.96x = 680,835.81
  5. Step 5: Solve for x
    x = 680,835.81/708.96
  6. Step 6: Final answer
    x = 960.33

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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.