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Finding the Fourth Proportional to 21,990.70, 32,986.05 and 18,102.70

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Solution

The fourth proportional to 21,990.70, 32,986.05 and 18,102.70 is: 27,154.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.70 : 32,986.05 = 18,102.70 : x
  2. Step 2: Convert to fraction form
    21,990.70/32,986.05 = 18,102.70/x
  3. Step 3: Cross multiply
    21,990.70x = 32,986.05 × 18,102.70
  4. Step 4: Simplify right side
    21,990.70x = 597,136,567.34
  5. Step 5: Solve for x
    x = 597,136,567.34/21,990.70
  6. Step 6: Final answer
    x = 27,154.05

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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.