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Finding the Fourth Proportional to 769.68, 1,155.72 and 686.64

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Solution

The fourth proportional to 769.68, 1,155.72 and 686.64 is: 1,031.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.68 : 1,155.72 = 686.64 : x
  2. Step 2: Convert to fraction form
    769.68/1,155.72 = 686.64/x
  3. Step 3: Cross multiply
    769.68x = 1,155.72 × 686.64
  4. Step 4: Simplify right side
    769.68x = 793,563.58
  5. Step 5: Solve for x
    x = 793,563.58/769.68
  6. Step 6: Final answer
    x = 1,031.03

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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.