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Finding the Fourth Proportional to 887.59, 1,224.99 and 638.92

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Solution

The fourth proportional to 887.59, 1,224.99 and 638.92 is: 881.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.59 : 1,224.99 = 638.92 : x
  2. Step 2: Convert to fraction form
    887.59/1,224.99 = 638.92/x
  3. Step 3: Cross multiply
    887.59x = 1,224.99 × 638.92
  4. Step 4: Simplify right side
    887.59x = 782,670.61
  5. Step 5: Solve for x
    x = 782,670.61/887.59
  6. Step 6: Final answer
    x = 881.79

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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.