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Finding the Fourth Proportional to 21,191.40, 31,795.20 and 20,859.30

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Solution

The fourth proportional to 21,191.40, 31,795.20 and 20,859.30 is: 31,296.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,191.40 : 31,795.20 = 20,859.30 : x
  2. Step 2: Convert to fraction form
    21,191.40/31,795.20 = 20,859.30/x
  3. Step 3: Cross multiply
    21,191.40x = 31,795.20 × 20,859.30
  4. Step 4: Simplify right side
    21,191.40x = 663,225,615.36
  5. Step 5: Solve for x
    x = 663,225,615.36/21,191.40
  6. Step 6: Final answer
    x = 31,296.92

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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.