Home / 20,976.10-31,455.95-7,821.29

Finding the Fourth Proportional to 20,976.10, 31,455.95 and 7,821.29

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Solution

The fourth proportional to 20,976.10, 31,455.95 and 7,821.29 is: 11,728.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.10 : 31,455.95 = 7,821.29 : x
  2. Step 2: Convert to fraction form
    20,976.10/31,455.95 = 7,821.29/x
  3. Step 3: Cross multiply
    20,976.10x = 31,455.95 × 7,821.29
  4. Step 4: Simplify right side
    20,976.10x = 246,026,146.71
  5. Step 5: Solve for x
    x = 246,026,146.71/20,976.10
  6. Step 6: Final answer
    x = 11,728.88

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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.