Home / 21,391.28-32,090-11,517.20

Finding the Fourth Proportional to 21,391.28, 32,090 and 11,517.20

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Solution

The fourth proportional to 21,391.28, 32,090 and 11,517.20 is: 17,277.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.28 : 32,090 = 11,517.20 : x
  2. Step 2: Convert to fraction form
    21,391.28/32,090 = 11,517.20/x
  3. Step 3: Cross multiply
    21,391.28x = 32,090 × 11,517.20
  4. Step 4: Simplify right side
    21,391.28x = 369,586,948
  5. Step 5: Solve for x
    x = 369,586,948/21,391.28
  6. Step 6: Final answer
    x = 17,277.46

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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.