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Finding the Fourth Proportional to 1,422.71, 2,134.97 and 557

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Solution

The fourth proportional to 1,422.71, 2,134.97 and 557 is: 835.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.71 : 2,134.97 = 557 : x
  2. Step 2: Convert to fraction form
    1,422.71/2,134.97 = 557/x
  3. Step 3: Cross multiply
    1,422.71x = 2,134.97 × 557
  4. Step 4: Simplify right side
    1,422.71x = 1,189,175.51
  5. Step 5: Solve for x
    x = 1,189,175.51/1,422.71
  6. Step 6: Final answer
    x = 835.85

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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.