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Finding the Fourth Proportional to 1,818.60, 2,726.55 and 722.40

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Solution

The fourth proportional to 1,818.60, 2,726.55 and 722.40 is: 1,083.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.60 : 2,726.55 = 722.40 : x
  2. Step 2: Convert to fraction form
    1,818.60/2,726.55 = 722.40/x
  3. Step 3: Cross multiply
    1,818.60x = 2,726.55 × 722.40
  4. Step 4: Simplify right side
    1,818.60x = 1,969,659.72
  5. Step 5: Solve for x
    x = 1,969,659.72/1,818.60
  6. Step 6: Final answer
    x = 1,083.06

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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.