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Finding the Fourth Proportional to 1,311.15, 1,808.87 and 751.32

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Solution

The fourth proportional to 1,311.15, 1,808.87 and 751.32 is: 1,036.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.15 : 1,808.87 = 751.32 : x
  2. Step 2: Convert to fraction form
    1,311.15/1,808.87 = 751.32/x
  3. Step 3: Cross multiply
    1,311.15x = 1,808.87 × 751.32
  4. Step 4: Simplify right side
    1,311.15x = 1,359,042.09
  5. Step 5: Solve for x
    x = 1,359,042.09/1,311.15
  6. Step 6: Final answer
    x = 1,036.53

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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.