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Finding the Fourth Proportional to 887.85, 1,223.78 and 638.78

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Solution

The fourth proportional to 887.85, 1,223.78 and 638.78 is: 880.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.85 : 1,223.78 = 638.78 : x
  2. Step 2: Convert to fraction form
    887.85/1,223.78 = 638.78/x
  3. Step 3: Cross multiply
    887.85x = 1,223.78 × 638.78
  4. Step 4: Simplify right side
    887.85x = 781,716.88
  5. Step 5: Solve for x
    x = 781,716.88/887.85
  6. Step 6: Final answer
    x = 880.46

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Double scale
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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.