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Finding the Fourth Proportional to 874.19, 1,308.14 and 642.50

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Solution

The fourth proportional to 874.19, 1,308.14 and 642.50 is: 961.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.19 : 1,308.14 = 642.50 : x
  2. Step 2: Convert to fraction form
    874.19/1,308.14 = 642.50/x
  3. Step 3: Cross multiply
    874.19x = 1,308.14 × 642.50
  4. Step 4: Simplify right side
    874.19x = 840,479.95
  5. Step 5: Solve for x
    x = 840,479.95/874.19
  6. Step 6: Final answer
    x = 961.44

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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.