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Finding the Fourth Proportional to 21,990.99, 32,990.49 and 7,200.70

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Solution

The fourth proportional to 21,990.99, 32,990.49 and 7,200.70 is: 10,802.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.99 : 32,990.49 = 7,200.70 : x
  2. Step 2: Convert to fraction form
    21,990.99/32,990.49 = 7,200.70/x
  3. Step 3: Cross multiply
    21,990.99x = 32,990.49 × 7,200.70
  4. Step 4: Simplify right side
    21,990.99x = 237,554,538.87
  5. Step 5: Solve for x
    x = 237,554,538.87/21,990.99
  6. Step 6: Final answer
    x = 10,802.36

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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.