Home / 31,812.28-43,920.84-20,487.40

Finding the Fourth Proportional to 31,812.28, 43,920.84 and 20,487.40

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Solution

The fourth proportional to 31,812.28, 43,920.84 and 20,487.40 is: 28,285.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,812.28 : 43,920.84 = 20,487.40 : x
  2. Step 2: Convert to fraction form
    31,812.28/43,920.84 = 20,487.40/x
  3. Step 3: Cross multiply
    31,812.28x = 43,920.84 × 20,487.40
  4. Step 4: Simplify right side
    31,812.28x = 899,823,817.42
  5. Step 5: Solve for x
    x = 899,823,817.42/31,812.28
  6. Step 6: Final answer
    x = 28,285.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.