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Finding the Fourth Proportional to 1,854.91, 2,781.91 and 538.66

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Solution

The fourth proportional to 1,854.91, 2,781.91 and 538.66 is: 807.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,854.91 : 2,781.91 = 538.66 : x
  2. Step 2: Convert to fraction form
    1,854.91/2,781.91 = 538.66/x
  3. Step 3: Cross multiply
    1,854.91x = 2,781.91 × 538.66
  4. Step 4: Simplify right side
    1,854.91x = 1,498,507.79
  5. Step 5: Solve for x
    x = 1,498,507.79/1,854.91
  6. Step 6: Final answer
    x = 807.86

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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.