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Finding the Fourth Proportional to 1,717.11, 2,576.75 and 840.15

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Solution

The fourth proportional to 1,717.11, 2,576.75 and 840.15 is: 1,260.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,717.11 : 2,576.75 = 840.15 : x
  2. Step 2: Convert to fraction form
    1,717.11/2,576.75 = 840.15/x
  3. Step 3: Cross multiply
    1,717.11x = 2,576.75 × 840.15
  4. Step 4: Simplify right side
    1,717.11x = 2,164,852.31
  5. Step 5: Solve for x
    x = 2,164,852.31/1,717.11
  6. Step 6: Final answer
    x = 1,260.75

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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.