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Finding the Fourth Proportional to 754.80, 1,134.60 and 697.20

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Solution

The fourth proportional to 754.80, 1,134.60 and 697.20 is: 1,048.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.80 : 1,134.60 = 697.20 : x
  2. Step 2: Convert to fraction form
    754.80/1,134.60 = 697.20/x
  3. Step 3: Cross multiply
    754.80x = 1,134.60 × 697.20
  4. Step 4: Simplify right side
    754.80x = 791,043.12
  5. Step 5: Solve for x
    x = 791,043.12/754.80
  6. Step 6: Final answer
    x = 1,048.02

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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.