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Finding the Fourth Proportional to 886.64, 1,328.52 and 521.76

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Solution

The fourth proportional to 886.64, 1,328.52 and 521.76 is: 781.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.64 : 1,328.52 = 521.76 : x
  2. Step 2: Convert to fraction form
    886.64/1,328.52 = 521.76/x
  3. Step 3: Cross multiply
    886.64x = 1,328.52 × 521.76
  4. Step 4: Simplify right side
    886.64x = 693,168.60
  5. Step 5: Solve for x
    x = 693,168.60/886.64
  6. Step 6: Final answer
    x = 781.79

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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.