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Finding the Fourth Proportional to 19,721.20, 29,581.80 and 18,108.40

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Solution

The fourth proportional to 19,721.20, 29,581.80 and 18,108.40 is: 27,162.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,721.20 : 29,581.80 = 18,108.40 : x
  2. Step 2: Convert to fraction form
    19,721.20/29,581.80 = 18,108.40/x
  3. Step 3: Cross multiply
    19,721.20x = 29,581.80 × 18,108.40
  4. Step 4: Simplify right side
    19,721.20x = 535,679,067.12
  5. Step 5: Solve for x
    x = 535,679,067.12/19,721.20
  6. Step 6: Final answer
    x = 27,162.60

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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.