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Finding the Fourth Proportional to 2,591.78, 3,887.70 and 947.68

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Solution

The fourth proportional to 2,591.78, 3,887.70 and 947.68 is: 1,421.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.78 : 3,887.70 = 947.68 : x
  2. Step 2: Convert to fraction form
    2,591.78/3,887.70 = 947.68/x
  3. Step 3: Cross multiply
    2,591.78x = 3,887.70 × 947.68
  4. Step 4: Simplify right side
    2,591.78x = 3,684,295.54
  5. Step 5: Solve for x
    x = 3,684,295.54/2,591.78
  6. Step 6: Final answer
    x = 1,421.53

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Similar ratio
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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.