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Finding the Fourth Proportional to 886.20, 1,221.51 and 699.36

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Solution

The fourth proportional to 886.20, 1,221.51 and 699.36 is: 963.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.20 : 1,221.51 = 699.36 : x
  2. Step 2: Convert to fraction form
    886.20/1,221.51 = 699.36/x
  3. Step 3: Cross multiply
    886.20x = 1,221.51 × 699.36
  4. Step 4: Simplify right side
    886.20x = 854,275.23
  5. Step 5: Solve for x
    x = 854,275.23/886.20
  6. Step 6: Final answer
    x = 963.98

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1.5x scale

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.