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Finding the Fourth Proportional to 680.02, 1,020.72 and 485.24

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Solution

The fourth proportional to 680.02, 1,020.72 and 485.24 is: 728.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.02 : 1,020.72 = 485.24 : x
  2. Step 2: Convert to fraction form
    680.02/1,020.72 = 485.24/x
  3. Step 3: Cross multiply
    680.02x = 1,020.72 × 485.24
  4. Step 4: Simplify right side
    680.02x = 495,294.17
  5. Step 5: Solve for x
    x = 495,294.17/680.02
  6. Step 6: Final answer
    x = 728.35

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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.