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Finding the Fourth Proportional to 715.28, 984.80 and 626.66

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Solution

The fourth proportional to 715.28, 984.80 and 626.66 is: 862.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.28 : 984.80 = 626.66 : x
  2. Step 2: Convert to fraction form
    715.28/984.80 = 626.66/x
  3. Step 3: Cross multiply
    715.28x = 984.80 × 626.66
  4. Step 4: Simplify right side
    715.28x = 617,126.71
  5. Step 5: Solve for x
    x = 617,126.71/715.28
  6. Step 6: Final answer
    x = 862.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.