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Finding the Fourth Proportional to 876.64, 1,320.16 and 634.86

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Solution

The fourth proportional to 876.64, 1,320.16 and 634.86 is: 956.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.64 : 1,320.16 = 634.86 : x
  2. Step 2: Convert to fraction form
    876.64/1,320.16 = 634.86/x
  3. Step 3: Cross multiply
    876.64x = 1,320.16 × 634.86
  4. Step 4: Simplify right side
    876.64x = 838,116.78
  5. Step 5: Solve for x
    x = 838,116.78/876.64
  6. Step 6: Final answer
    x = 956.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.