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Finding the Fourth Proportional to 21,806.80, 32,710.20 and 7,961.20

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Solution

The fourth proportional to 21,806.80, 32,710.20 and 7,961.20 is: 11,941.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.80 : 32,710.20 = 7,961.20 : x
  2. Step 2: Convert to fraction form
    21,806.80/32,710.20 = 7,961.20/x
  3. Step 3: Cross multiply
    21,806.80x = 32,710.20 × 7,961.20
  4. Step 4: Simplify right side
    21,806.80x = 260,412,444.24
  5. Step 5: Solve for x
    x = 260,412,444.24/21,806.80
  6. Step 6: Final answer
    x = 11,941.80

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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.