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Finding the Fourth Proportional to 669.83, 1,003.46 and 515.52

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Solution

The fourth proportional to 669.83, 1,003.46 and 515.52 is: 772.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.83 : 1,003.46 = 515.52 : x
  2. Step 2: Convert to fraction form
    669.83/1,003.46 = 515.52/x
  3. Step 3: Cross multiply
    669.83x = 1,003.46 × 515.52
  4. Step 4: Simplify right side
    669.83x = 517,301.12
  5. Step 5: Solve for x
    x = 517,301.12/669.83
  6. Step 6: Final answer
    x = 772.29

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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.