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Finding the Fourth Proportional to 1,543.18, 2,129.40 and 880

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Solution

The fourth proportional to 1,543.18, 2,129.40 and 880 is: 1,214.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.18 : 2,129.40 = 880 : x
  2. Step 2: Convert to fraction form
    1,543.18/2,129.40 = 880/x
  3. Step 3: Cross multiply
    1,543.18x = 2,129.40 × 880
  4. Step 4: Simplify right side
    1,543.18x = 1,873,872
  5. Step 5: Solve for x
    x = 1,873,872/1,543.18
  6. Step 6: Final answer
    x = 1,214.29

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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.