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Finding the Fourth Proportional to 21,988.70, 32,946.60 and 18,270.80

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Solution

The fourth proportional to 21,988.70, 32,946.60 and 18,270.80 is: 27,375.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.70 : 32,946.60 = 18,270.80 : x
  2. Step 2: Convert to fraction form
    21,988.70/32,946.60 = 18,270.80/x
  3. Step 3: Cross multiply
    21,988.70x = 32,946.60 × 18,270.80
  4. Step 4: Simplify right side
    21,988.70x = 601,960,739.28
  5. Step 5: Solve for x
    x = 601,960,739.28/21,988.70
  6. Step 6: Final answer
    x = 27,375.91

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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.