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Finding the Fourth Proportional to 698.16, 1,047.20 and 626.88

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Solution

The fourth proportional to 698.16, 1,047.20 and 626.88 is: 940.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.16 : 1,047.20 = 626.88 : x
  2. Step 2: Convert to fraction form
    698.16/1,047.20 = 626.88/x
  3. Step 3: Cross multiply
    698.16x = 1,047.20 × 626.88
  4. Step 4: Simplify right side
    698.16x = 656,468.74
  5. Step 5: Solve for x
    x = 656,468.74/698.16
  6. Step 6: Final answer
    x = 940.28

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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.