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Finding the Fourth Proportional to 887.85, 1,225.20 and 494.87

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Solution

The fourth proportional to 887.85, 1,225.20 and 494.87 is: 682.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.85 : 1,225.20 = 494.87 : x
  2. Step 2: Convert to fraction form
    887.85/1,225.20 = 494.87/x
  3. Step 3: Cross multiply
    887.85x = 1,225.20 × 494.87
  4. Step 4: Simplify right side
    887.85x = 606,308.60
  5. Step 5: Solve for x
    x = 606,308.60/887.85
  6. Step 6: Final answer
    x = 682.90

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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.