Home / 12,876.90-19,317.53-3,990.20

Finding the Fourth Proportional to 12,876.90, 19,317.53 and 3,990.20

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Solution

The fourth proportional to 12,876.90, 19,317.53 and 3,990.20 is: 5,985.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,876.90 : 19,317.53 = 3,990.20 : x
  2. Step 2: Convert to fraction form
    12,876.90/19,317.53 = 3,990.20/x
  3. Step 3: Cross multiply
    12,876.90x = 19,317.53 × 3,990.20
  4. Step 4: Simplify right side
    12,876.90x = 77,080,691.67
  5. Step 5: Solve for x
    x = 77,080,691.67/12,876.90
  6. Step 6: Final answer
    x = 5,985.97

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1.5x scale

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.