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Finding the Fourth Proportional to 709.26, 1,064.21 and 400.65

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Solution

The fourth proportional to 709.26, 1,064.21 and 400.65 is: 601.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.26 : 1,064.21 = 400.65 : x
  2. Step 2: Convert to fraction form
    709.26/1,064.21 = 400.65/x
  3. Step 3: Cross multiply
    709.26x = 1,064.21 × 400.65
  4. Step 4: Simplify right side
    709.26x = 426,373.73
  5. Step 5: Solve for x
    x = 426,373.73/709.26
  6. Step 6: Final answer
    x = 601.15

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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.