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Finding the Fourth Proportional to 784.08, 1,179.36 and 686.88

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Solution

The fourth proportional to 784.08, 1,179.36 and 686.88 is: 1,033.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.08 : 1,179.36 = 686.88 : x
  2. Step 2: Convert to fraction form
    784.08/1,179.36 = 686.88/x
  3. Step 3: Cross multiply
    784.08x = 1,179.36 × 686.88
  4. Step 4: Simplify right side
    784.08x = 810,078.80
  5. Step 5: Solve for x
    x = 810,078.80/784.08
  6. Step 6: Final answer
    x = 1,033.16

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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.