Home / 3,129.12-4,690.40-1,281.48

Finding the Fourth Proportional to 3,129.12, 4,690.40 and 1,281.48

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Solution

The fourth proportional to 3,129.12, 4,690.40 and 1,281.48 is: 1,920.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.12 : 4,690.40 = 1,281.48 : x
  2. Step 2: Convert to fraction form
    3,129.12/4,690.40 = 1,281.48/x
  3. Step 3: Cross multiply
    3,129.12x = 4,690.40 × 1,281.48
  4. Step 4: Simplify right side
    3,129.12x = 6,010,653.79
  5. Step 5: Solve for x
    x = 6,010,653.79/3,129.12
  6. Step 6: Final answer
    x = 1,920.88

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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.