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Finding the Fourth Proportional to 887.64, 1,331.45 and 400.12

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Solution

The fourth proportional to 887.64, 1,331.45 and 400.12 is: 600.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.64 : 1,331.45 = 400.12 : x
  2. Step 2: Convert to fraction form
    887.64/1,331.45 = 400.12/x
  3. Step 3: Cross multiply
    887.64x = 1,331.45 × 400.12
  4. Step 4: Simplify right side
    887.64x = 532,737.45
  5. Step 5: Solve for x
    x = 532,737.45/887.64
  6. Step 6: Final answer
    x = 600.18

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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.