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Finding the Fourth Proportional to 669.79, 1,003.15 and 485.29

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Solution

The fourth proportional to 669.79, 1,003.15 and 485.29 is: 726.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.79 : 1,003.15 = 485.29 : x
  2. Step 2: Convert to fraction form
    669.79/1,003.15 = 485.29/x
  3. Step 3: Cross multiply
    669.79x = 1,003.15 × 485.29
  4. Step 4: Simplify right side
    669.79x = 486,818.66
  5. Step 5: Solve for x
    x = 486,818.66/669.79
  6. Step 6: Final answer
    x = 726.82

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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.