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Finding the Fourth Proportional to 1,236.86, 1,854.07 and 543.90

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Solution

The fourth proportional to 1,236.86, 1,854.07 and 543.90 is: 815.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.86 : 1,854.07 = 543.90 : x
  2. Step 2: Convert to fraction form
    1,236.86/1,854.07 = 543.90/x
  3. Step 3: Cross multiply
    1,236.86x = 1,854.07 × 543.90
  4. Step 4: Simplify right side
    1,236.86x = 1,008,428.67
  5. Step 5: Solve for x
    x = 1,008,428.67/1,236.86
  6. Step 6: Final answer
    x = 815.31

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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.