Home / 19,872.12-27,420.30-11,487

Finding the Fourth Proportional to 19,872.12, 27,420.30 and 11,487

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Solution

The fourth proportional to 19,872.12, 27,420.30 and 11,487 is: 15,850.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,872.12 : 27,420.30 = 11,487 : x
  2. Step 2: Convert to fraction form
    19,872.12/27,420.30 = 11,487/x
  3. Step 3: Cross multiply
    19,872.12x = 27,420.30 × 11,487
  4. Step 4: Simplify right side
    19,872.12x = 314,976,986.10
  5. Step 5: Solve for x
    x = 314,976,986.10/19,872.12
  6. Step 6: Final answer
    x = 15,850.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.