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Finding the Fourth Proportional to 706.92, 1,061.34 and 399.72

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Solution

The fourth proportional to 706.92, 1,061.34 and 399.72 is: 600.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.92 : 1,061.34 = 399.72 : x
  2. Step 2: Convert to fraction form
    706.92/1,061.34 = 399.72/x
  3. Step 3: Cross multiply
    706.92x = 1,061.34 × 399.72
  4. Step 4: Simplify right side
    706.92x = 424,238.82
  5. Step 5: Solve for x
    x = 424,238.82/706.92
  6. Step 6: Final answer
    x = 600.12

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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.