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Finding the Fourth Proportional to 680.40, 1,015.20 and 572.40

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Solution

The fourth proportional to 680.40, 1,015.20 and 572.40 is: 854.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.40 : 1,015.20 = 572.40 : x
  2. Step 2: Convert to fraction form
    680.40/1,015.20 = 572.40/x
  3. Step 3: Cross multiply
    680.40x = 1,015.20 × 572.40
  4. Step 4: Simplify right side
    680.40x = 581,100.48
  5. Step 5: Solve for x
    x = 581,100.48/680.40
  6. Step 6: Final answer
    x = 854.06

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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.