Home / 21,077.20-31,631.36-9,983.88

Finding the Fourth Proportional to 21,077.20, 31,631.36 and 9,983.88

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Solution

The fourth proportional to 21,077.20, 31,631.36 and 9,983.88 is: 14,983.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,077.20 : 31,631.36 = 9,983.88 : x
  2. Step 2: Convert to fraction form
    21,077.20/31,631.36 = 9,983.88/x
  3. Step 3: Cross multiply
    21,077.20x = 31,631.36 × 9,983.88
  4. Step 4: Simplify right side
    21,077.20x = 315,803,727.44
  5. Step 5: Solve for x
    x = 315,803,727.44/21,077.20
  6. Step 6: Final answer
    x = 14,983.19

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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.