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Finding the Fourth Proportional to 1,380.39, 2,070.96 and 558.48

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Solution

The fourth proportional to 1,380.39, 2,070.96 and 558.48 is: 837.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.39 : 2,070.96 = 558.48 : x
  2. Step 2: Convert to fraction form
    1,380.39/2,070.96 = 558.48/x
  3. Step 3: Cross multiply
    1,380.39x = 2,070.96 × 558.48
  4. Step 4: Simplify right side
    1,380.39x = 1,156,589.74
  5. Step 5: Solve for x
    x = 1,156,589.74/1,380.39
  6. Step 6: Final answer
    x = 837.87

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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.