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Finding the Fourth Proportional to 699.85, 1,049.20 and 479.87

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Solution

The fourth proportional to 699.85, 1,049.20 and 479.87 is: 719.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.85 : 1,049.20 = 479.87 : x
  2. Step 2: Convert to fraction form
    699.85/1,049.20 = 479.87/x
  3. Step 3: Cross multiply
    699.85x = 1,049.20 × 479.87
  4. Step 4: Simplify right side
    699.85x = 503,471.96
  5. Step 5: Solve for x
    x = 503,471.96/699.85
  6. Step 6: Final answer
    x = 719.40

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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.