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Finding the Fourth Proportional to 1,508, 2,262.44 and 642.40

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Solution

The fourth proportional to 1,508, 2,262.44 and 642.40 is: 963.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,508 : 2,262.44 = 642.40 : x
  2. Step 2: Convert to fraction form
    1,508/2,262.44 = 642.40/x
  3. Step 3: Cross multiply
    1,508x = 2,262.44 × 642.40
  4. Step 4: Simplify right side
    1,508x = 1,453,391.46
  5. Step 5: Solve for x
    x = 1,453,391.46/1,508
  6. Step 6: Final answer
    x = 963.79

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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.