Home / 2,931.20-4,394.88-1,287.68

Finding the Fourth Proportional to 2,931.20, 4,394.88 and 1,287.68

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Solution

The fourth proportional to 2,931.20, 4,394.88 and 1,287.68 is: 1,930.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,931.20 : 4,394.88 = 1,287.68 : x
  2. Step 2: Convert to fraction form
    2,931.20/4,394.88 = 1,287.68/x
  3. Step 3: Cross multiply
    2,931.20x = 4,394.88 × 1,287.68
  4. Step 4: Simplify right side
    2,931.20x = 5,659,199.08
  5. Step 5: Solve for x
    x = 5,659,199.08/2,931.20
  6. Step 6: Final answer
    x = 1,930.68

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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.