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Finding the Fourth Proportional to 1,531.83, 2,113.95 and 833.20

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Solution

The fourth proportional to 1,531.83, 2,113.95 and 833.20 is: 1,149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.83 : 2,113.95 = 833.20 : x
  2. Step 2: Convert to fraction form
    1,531.83/2,113.95 = 833.20/x
  3. Step 3: Cross multiply
    1,531.83x = 2,113.95 × 833.20
  4. Step 4: Simplify right side
    1,531.83x = 1,761,348.18
  5. Step 5: Solve for x
    x = 1,761,348.18/1,531.83
  6. Step 6: Final answer
    x = 1,149.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.