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Finding the Fourth Proportional to 21,990.60, 32,985.90 and 12,149.10

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Solution

The fourth proportional to 21,990.60, 32,985.90 and 12,149.10 is: 18,223.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.60 : 32,985.90 = 12,149.10 : x
  2. Step 2: Convert to fraction form
    21,990.60/32,985.90 = 12,149.10/x
  3. Step 3: Cross multiply
    21,990.60x = 32,985.90 × 12,149.10
  4. Step 4: Simplify right side
    21,990.60x = 400,748,997.69
  5. Step 5: Solve for x
    x = 400,748,997.69/21,990.60
  6. Step 6: Final answer
    x = 18,223.65

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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.