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Finding the Fourth Proportional to 21,987.70, 32,945.10 and 18,269.80

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Solution

The fourth proportional to 21,987.70, 32,945.10 and 18,269.80 is: 27,374.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.70 : 32,945.10 = 18,269.80 : x
  2. Step 2: Convert to fraction form
    21,987.70/32,945.10 = 18,269.80/x
  3. Step 3: Cross multiply
    21,987.70x = 32,945.10 × 18,269.80
  4. Step 4: Simplify right side
    21,987.70x = 601,900,387.98
  5. Step 5: Solve for x
    x = 601,900,387.98/21,987.70
  6. Step 6: Final answer
    x = 27,374.41

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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.