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Finding the Fourth Proportional to 1,778.18, 2,666.90 and 479.34

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Solution

The fourth proportional to 1,778.18, 2,666.90 and 479.34 is: 718.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.18 : 2,666.90 = 479.34 : x
  2. Step 2: Convert to fraction form
    1,778.18/2,666.90 = 479.34/x
  3. Step 3: Cross multiply
    1,778.18x = 2,666.90 × 479.34
  4. Step 4: Simplify right side
    1,778.18x = 1,278,351.85
  5. Step 5: Solve for x
    x = 1,278,351.85/1,778.18
  6. Step 6: Final answer
    x = 718.91

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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.