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Finding the Fourth Proportional to 886.22, 1,328.96 and 423.64

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Solution

The fourth proportional to 886.22, 1,328.96 and 423.64 is: 635.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.22 : 1,328.96 = 423.64 : x
  2. Step 2: Convert to fraction form
    886.22/1,328.96 = 423.64/x
  3. Step 3: Cross multiply
    886.22x = 1,328.96 × 423.64
  4. Step 4: Simplify right side
    886.22x = 563,000.61
  5. Step 5: Solve for x
    x = 563,000.61/886.22
  6. Step 6: Final answer
    x = 635.28

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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.