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Finding the Fourth Proportional to 21,301.60, 31,990.80 and 20,610.40

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Solution

The fourth proportional to 21,301.60, 31,990.80 and 20,610.40 is: 30,952.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,301.60 : 31,990.80 = 20,610.40 : x
  2. Step 2: Convert to fraction form
    21,301.60/31,990.80 = 20,610.40/x
  3. Step 3: Cross multiply
    21,301.60x = 31,990.80 × 20,610.40
  4. Step 4: Simplify right side
    21,301.60x = 659,343,184.32
  5. Step 5: Solve for x
    x = 659,343,184.32/21,301.60
  6. Step 6: Final answer
    x = 30,952.75

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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.