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Finding the Fourth Proportional to 887.13, 1,222.98 and 638.00

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Solution

The fourth proportional to 887.13, 1,222.98 and 638.00 is: 879.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.13 : 1,222.98 = 638.00 : x
  2. Step 2: Convert to fraction form
    887.13/1,222.98 = 638.00/x
  3. Step 3: Cross multiply
    887.13x = 1,222.98 × 638.00
  4. Step 4: Simplify right side
    887.13x = 780,255.13
  5. Step 5: Solve for x
    x = 780,255.13/887.13
  6. Step 6: Final answer
    x = 879.53

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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.