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Finding the Fourth Proportional to 20,693.60, 31,040.40 and 12,399.20

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Solution

The fourth proportional to 20,693.60, 31,040.40 and 12,399.20 is: 18,598.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,693.60 : 31,040.40 = 12,399.20 : x
  2. Step 2: Convert to fraction form
    20,693.60/31,040.40 = 12,399.20/x
  3. Step 3: Cross multiply
    20,693.60x = 31,040.40 × 12,399.20
  4. Step 4: Simplify right side
    20,693.60x = 384,876,127.68
  5. Step 5: Solve for x
    x = 384,876,127.68/20,693.60
  6. Step 6: Final answer
    x = 18,598.80

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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.