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Finding the Fourth Proportional to 872.04, 1,308.78 and 613.92

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Solution

The fourth proportional to 872.04, 1,308.78 and 613.92 is: 921.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.04 : 1,308.78 = 613.92 : x
  2. Step 2: Convert to fraction form
    872.04/1,308.78 = 613.92/x
  3. Step 3: Cross multiply
    872.04x = 1,308.78 × 613.92
  4. Step 4: Simplify right side
    872.04x = 803,486.22
  5. Step 5: Solve for x
    x = 803,486.22/872.04
  6. Step 6: Final answer
    x = 921.39

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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.