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Finding the Fourth Proportional to 3,385.79, 5,078.28 and 887.21

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Solution

The fourth proportional to 3,385.79, 5,078.28 and 887.21 is: 1,330.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,385.79 : 5,078.28 = 887.21 : x
  2. Step 2: Convert to fraction form
    3,385.79/5,078.28 = 887.21/x
  3. Step 3: Cross multiply
    3,385.79x = 5,078.28 × 887.21
  4. Step 4: Simplify right side
    3,385.79x = 4,505,475.41
  5. Step 5: Solve for x
    x = 4,505,475.41/3,385.79
  6. Step 6: Final answer
    x = 1,330.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.