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Finding the Fourth Proportional to 872.64, 1,309.84 and 853.04

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Solution

The fourth proportional to 872.64, 1,309.84 and 853.04 is: 1,280.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.64 : 1,309.84 = 853.04 : x
  2. Step 2: Convert to fraction form
    872.64/1,309.84 = 853.04/x
  3. Step 3: Cross multiply
    872.64x = 1,309.84 × 853.04
  4. Step 4: Simplify right side
    872.64x = 1,117,345.91
  5. Step 5: Solve for x
    x = 1,117,345.91/872.64
  6. Step 6: Final answer
    x = 1,280.42

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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.