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Finding the Fourth Proportional to 1,791, 2,686.56 and 558.40

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Solution

The fourth proportional to 1,791, 2,686.56 and 558.40 is: 837.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791 : 2,686.56 = 558.40 : x
  2. Step 2: Convert to fraction form
    1,791/2,686.56 = 558.40/x
  3. Step 3: Cross multiply
    1,791x = 2,686.56 × 558.40
  4. Step 4: Simplify right side
    1,791x = 1,500,175.10
  5. Step 5: Solve for x
    x = 1,500,175.10/1,791
  6. Step 6: Final answer
    x = 837.62

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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.