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Finding the Fourth Proportional to 1,339.08, 2,007 and 722.40

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Solution

The fourth proportional to 1,339.08, 2,007 and 722.40 is: 1,082.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.08 : 2,007 = 722.40 : x
  2. Step 2: Convert to fraction form
    1,339.08/2,007 = 722.40/x
  3. Step 3: Cross multiply
    1,339.08x = 2,007 × 722.40
  4. Step 4: Simplify right side
    1,339.08x = 1,449,856.80
  5. Step 5: Solve for x
    x = 1,449,856.80/1,339.08
  6. Step 6: Final answer
    x = 1,082.73

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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.