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Finding the Fourth Proportional to 1,543.07, 2,129.40 and 879.81

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Solution

The fourth proportional to 1,543.07, 2,129.40 and 879.81 is: 1,214.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.07 : 2,129.40 = 879.81 : x
  2. Step 2: Convert to fraction form
    1,543.07/2,129.40 = 879.81/x
  3. Step 3: Cross multiply
    1,543.07x = 2,129.40 × 879.81
  4. Step 4: Simplify right side
    1,543.07x = 1,873,467.41
  5. Step 5: Solve for x
    x = 1,873,467.41/1,543.07
  6. Step 6: Final answer
    x = 1,214.12

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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.