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Finding the Fourth Proportional to 680.46, 1,019.46 and 515.61

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Solution

The fourth proportional to 680.46, 1,019.46 and 515.61 is: 772.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.46 : 1,019.46 = 515.61 : x
  2. Step 2: Convert to fraction form
    680.46/1,019.46 = 515.61/x
  3. Step 3: Cross multiply
    680.46x = 1,019.46 × 515.61
  4. Step 4: Simplify right side
    680.46x = 525,643.77
  5. Step 5: Solve for x
    x = 525,643.77/680.46
  6. Step 6: Final answer
    x = 772.48

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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.