Home / 28,517.28-42,783.21-11,871.78

Finding the Fourth Proportional to 28,517.28, 42,783.21 and 11,871.78

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Solution

The fourth proportional to 28,517.28, 42,783.21 and 11,871.78 is: 17,810.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,517.28 : 42,783.21 = 11,871.78 : x
  2. Step 2: Convert to fraction form
    28,517.28/42,783.21 = 11,871.78/x
  3. Step 3: Cross multiply
    28,517.28x = 42,783.21 × 11,871.78
  4. Step 4: Simplify right side
    28,517.28x = 507,912,856.81
  5. Step 5: Solve for x
    x = 507,912,856.81/28,517.28
  6. Step 6: Final answer
    x = 17,810.70

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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.