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Finding the Fourth Proportional to 728.08, 1,084.76 and 691.36

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Solution

The fourth proportional to 728.08, 1,084.76 and 691.36 is: 1,030.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.08 : 1,084.76 = 691.36 : x
  2. Step 2: Convert to fraction form
    728.08/1,084.76 = 691.36/x
  3. Step 3: Cross multiply
    728.08x = 1,084.76 × 691.36
  4. Step 4: Simplify right side
    728.08x = 749,959.67
  5. Step 5: Solve for x
    x = 749,959.67/728.08
  6. Step 6: Final answer
    x = 1,030.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.