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Finding the Fourth Proportional to 754.05, 1,039.61 and 488.02

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Solution

The fourth proportional to 754.05, 1,039.61 and 488.02 is: 672.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.05 : 1,039.61 = 488.02 : x
  2. Step 2: Convert to fraction form
    754.05/1,039.61 = 488.02/x
  3. Step 3: Cross multiply
    754.05x = 1,039.61 × 488.02
  4. Step 4: Simplify right side
    754.05x = 507,348.80
  5. Step 5: Solve for x
    x = 507,348.80/754.05
  6. Step 6: Final answer
    x = 672.83

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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.