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Finding the Fourth Proportional to 21,836.40, 32,711.40 and 20,281.20

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Solution

The fourth proportional to 21,836.40, 32,711.40 and 20,281.20 is: 30,381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,836.40 : 32,711.40 = 20,281.20 : x
  2. Step 2: Convert to fraction form
    21,836.40/32,711.40 = 20,281.20/x
  3. Step 3: Cross multiply
    21,836.40x = 32,711.40 × 20,281.20
  4. Step 4: Simplify right side
    21,836.40x = 663,426,445.68
  5. Step 5: Solve for x
    x = 663,426,445.68/21,836.40
  6. Step 6: Final answer
    x = 30,381.68

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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.