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Finding the Fourth Proportional to 1,543.11, 2,129.72 and 953.61

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Solution

The fourth proportional to 1,543.11, 2,129.72 and 953.61 is: 1,316.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.11 : 2,129.72 = 953.61 : x
  2. Step 2: Convert to fraction form
    1,543.11/2,129.72 = 953.61/x
  3. Step 3: Cross multiply
    1,543.11x = 2,129.72 × 953.61
  4. Step 4: Simplify right side
    1,543.11x = 2,030,917.52
  5. Step 5: Solve for x
    x = 2,030,917.52/1,543.11
  6. Step 6: Final answer
    x = 1,316.12

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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.