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Finding the Fourth Proportional to 886.10, 1,221.09 and 875.30

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Solution

The fourth proportional to 886.10, 1,221.09 and 875.30 is: 1,206.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.10 : 1,221.09 = 875.30 : x
  2. Step 2: Convert to fraction form
    886.10/1,221.09 = 875.30/x
  3. Step 3: Cross multiply
    886.10x = 1,221.09 × 875.30
  4. Step 4: Simplify right side
    886.10x = 1,068,820.08
  5. Step 5: Solve for x
    x = 1,068,820.08/886.10
  6. Step 6: Final answer
    x = 1,206.21

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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.