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Finding the Fourth Proportional to 680.60, 1,014.72 and 615

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Solution

The fourth proportional to 680.60, 1,014.72 and 615 is: 916.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.60 : 1,014.72 = 615 : x
  2. Step 2: Convert to fraction form
    680.60/1,014.72 = 615/x
  3. Step 3: Cross multiply
    680.60x = 1,014.72 × 615
  4. Step 4: Simplify right side
    680.60x = 624,052.80
  5. Step 5: Solve for x
    x = 624,052.80/680.60
  6. Step 6: Final answer
    x = 916.92

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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.