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Finding the Fourth Proportional to 1,728.78, 2,591.56 and 632.86

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Solution

The fourth proportional to 1,728.78, 2,591.56 and 632.86 is: 948.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.78 : 2,591.56 = 632.86 : x
  2. Step 2: Convert to fraction form
    1,728.78/2,591.56 = 632.86/x
  3. Step 3: Cross multiply
    1,728.78x = 2,591.56 × 632.86
  4. Step 4: Simplify right side
    1,728.78x = 1,640,094.66
  5. Step 5: Solve for x
    x = 1,640,094.66/1,728.78
  6. Step 6: Final answer
    x = 948.70

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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.