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Finding the Fourth Proportional to 672.72, 1,009.80 and 565.68

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Solution

The fourth proportional to 672.72, 1,009.80 and 565.68 is: 849.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.72 : 1,009.80 = 565.68 : x
  2. Step 2: Convert to fraction form
    672.72/1,009.80 = 565.68/x
  3. Step 3: Cross multiply
    672.72x = 1,009.80 × 565.68
  4. Step 4: Simplify right side
    672.72x = 571,223.66
  5. Step 5: Solve for x
    x = 571,223.66/672.72
  6. Step 6: Final answer
    x = 849.13

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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.