Home / 21,147.57-31,693.80-11,787.21

Finding the Fourth Proportional to 21,147.57, 31,693.80 and 11,787.21

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Solution

The fourth proportional to 21,147.57, 31,693.80 and 11,787.21 is: 17,665.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,147.57 : 31,693.80 = 11,787.21 : x
  2. Step 2: Convert to fraction form
    21,147.57/31,693.80 = 11,787.21/x
  3. Step 3: Cross multiply
    21,147.57x = 31,693.80 × 11,787.21
  4. Step 4: Simplify right side
    21,147.57x = 373,581,476.30
  5. Step 5: Solve for x
    x = 373,581,476.30/21,147.57
  6. Step 6: Final answer
    x = 17,665.46

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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.