Home / 1,327.92-1,988.77-1,281.78

Finding the Fourth Proportional to 1,327.92, 1,988.77 and 1,281.78

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Solution

The fourth proportional to 1,327.92, 1,988.77 and 1,281.78 is: 1,919.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.92 : 1,988.77 = 1,281.78 : x
  2. Step 2: Convert to fraction form
    1,327.92/1,988.77 = 1,281.78/x
  3. Step 3: Cross multiply
    1,327.92x = 1,988.77 × 1,281.78
  4. Step 4: Simplify right side
    1,327.92x = 2,549,165.61
  5. Step 5: Solve for x
    x = 2,549,165.61/1,327.92
  6. Step 6: Final answer
    x = 1,919.67

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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.