Home / 20,981.10-31,472.07-7,830.85

Finding the Fourth Proportional to 20,981.10, 31,472.07 and 7,830.85

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Solution

The fourth proportional to 20,981.10, 31,472.07 and 7,830.85 is: 11,746.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.10 : 31,472.07 = 7,830.85 : x
  2. Step 2: Convert to fraction form
    20,981.10/31,472.07 = 7,830.85/x
  3. Step 3: Cross multiply
    20,981.10x = 31,472.07 × 7,830.85
  4. Step 4: Simplify right side
    20,981.10x = 246,453,059.36
  5. Step 5: Solve for x
    x = 246,453,059.36/20,981.10
  6. Step 6: Final answer
    x = 11,746.43

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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.