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Finding the Fourth Proportional to 887.55, 1,223.13 and 638.43

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Solution

The fourth proportional to 887.55, 1,223.13 and 638.43 is: 879.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.55 : 1,223.13 = 638.43 : x
  2. Step 2: Convert to fraction form
    887.55/1,223.13 = 638.43/x
  3. Step 3: Cross multiply
    887.55x = 1,223.13 × 638.43
  4. Step 4: Simplify right side
    887.55x = 780,882.89
  5. Step 5: Solve for x
    x = 780,882.89/887.55
  6. Step 6: Final answer
    x = 879.82

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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.