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Finding the Fourth Proportional to 1,351.71, 2,025.17 and 917.31

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Solution

The fourth proportional to 1,351.71, 2,025.17 and 917.31 is: 1,374.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.71 : 2,025.17 = 917.31 : x
  2. Step 2: Convert to fraction form
    1,351.71/2,025.17 = 917.31/x
  3. Step 3: Cross multiply
    1,351.71x = 2,025.17 × 917.31
  4. Step 4: Simplify right side
    1,351.71x = 1,857,704.11
  5. Step 5: Solve for x
    x = 1,857,704.11/1,351.71
  6. Step 6: Final answer
    x = 1,374.34

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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.