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Finding the Fourth Proportional to 886.11, 1,328.64 and 423.28

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Solution

The fourth proportional to 886.11, 1,328.64 and 423.28 is: 634.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.11 : 1,328.64 = 423.28 : x
  2. Step 2: Convert to fraction form
    886.11/1,328.64 = 423.28/x
  3. Step 3: Cross multiply
    886.11x = 1,328.64 × 423.28
  4. Step 4: Simplify right side
    886.11x = 562,381.12
  5. Step 5: Solve for x
    x = 562,381.12/886.11
  6. Step 6: Final answer
    x = 634.66

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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.