Home / 1,311.47-1,966.27-1,188.45

Finding the Fourth Proportional to 1,311.47, 1,966.27 and 1,188.45

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Solution

The fourth proportional to 1,311.47, 1,966.27 and 1,188.45 is: 1,781.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.47 : 1,966.27 = 1,188.45 : x
  2. Step 2: Convert to fraction form
    1,311.47/1,966.27 = 1,188.45/x
  3. Step 3: Cross multiply
    1,311.47x = 1,966.27 × 1,188.45
  4. Step 4: Simplify right side
    1,311.47x = 2,336,813.58
  5. Step 5: Solve for x
    x = 2,336,813.58/1,311.47
  6. Step 6: Final answer
    x = 1,781.83

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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.