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Finding the Fourth Proportional to 1,339.60, 2,008.68 and 414.76

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Solution

The fourth proportional to 1,339.60, 2,008.68 and 414.76 is: 621.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.60 : 2,008.68 = 414.76 : x
  2. Step 2: Convert to fraction form
    1,339.60/2,008.68 = 414.76/x
  3. Step 3: Cross multiply
    1,339.60x = 2,008.68 × 414.76
  4. Step 4: Simplify right side
    1,339.60x = 833,120.12
  5. Step 5: Solve for x
    x = 833,120.12/1,339.60
  6. Step 6: Final answer
    x = 621.92

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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.