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Finding the Fourth Proportional to 21,999.40, 32,999.10 and 7,208.80

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Solution

The fourth proportional to 21,999.40, 32,999.10 and 7,208.80 is: 10,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.40 : 32,999.10 = 7,208.80 : x
  2. Step 2: Convert to fraction form
    21,999.40/32,999.10 = 7,208.80/x
  3. Step 3: Cross multiply
    21,999.40x = 32,999.10 × 7,208.80
  4. Step 4: Simplify right side
    21,999.40x = 237,883,912.08
  5. Step 5: Solve for x
    x = 237,883,912.08/21,999.40
  6. Step 6: Final answer
    x = 10,813.20

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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.