Home / 28,318.40-42,439.20-20,100.80

Finding the Fourth Proportional to 28,318.40, 42,439.20 and 20,100.80

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Solution

The fourth proportional to 28,318.40, 42,439.20 and 20,100.80 is: 30,123.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.40 : 42,439.20 = 20,100.80 : x
  2. Step 2: Convert to fraction form
    28,318.40/42,439.20 = 20,100.80/x
  3. Step 3: Cross multiply
    28,318.40x = 42,439.20 × 20,100.80
  4. Step 4: Simplify right side
    28,318.40x = 853,061,871.36
  5. Step 5: Solve for x
    x = 853,061,871.36/28,318.40
  6. Step 6: Final answer
    x = 30,123.94

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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.