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Finding the Fourth Proportional to 876.60, 1,208.25 and 679.86

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Solution

The fourth proportional to 876.60, 1,208.25 and 679.86 is: 937.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.60 : 1,208.25 = 679.86 : x
  2. Step 2: Convert to fraction form
    876.60/1,208.25 = 679.86/x
  3. Step 3: Cross multiply
    876.60x = 1,208.25 × 679.86
  4. Step 4: Simplify right side
    876.60x = 821,440.85
  5. Step 5: Solve for x
    x = 821,440.85/876.60
  6. Step 6: Final answer
    x = 937.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.