Home / 28,220.20-42,362.70-17,139.40

Finding the Fourth Proportional to 28,220.20, 42,362.70 and 17,139.40

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Solution

The fourth proportional to 28,220.20, 42,362.70 and 17,139.40 is: 25,728.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,220.20 : 42,362.70 = 17,139.40 : x
  2. Step 2: Convert to fraction form
    28,220.20/42,362.70 = 17,139.40/x
  3. Step 3: Cross multiply
    28,220.20x = 42,362.70 × 17,139.40
  4. Step 4: Simplify right side
    28,220.20x = 726,071,260.38
  5. Step 5: Solve for x
    x = 726,071,260.38/28,220.20
  6. Step 6: Final answer
    x = 25,728.78

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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.