Home / 28,278.72-42,418.05-7,218.78

Finding the Fourth Proportional to 28,278.72, 42,418.05 and 7,218.78

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Solution

The fourth proportional to 28,278.72, 42,418.05 and 7,218.78 is: 10,828.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,278.72 : 42,418.05 = 7,218.78 : x
  2. Step 2: Convert to fraction form
    28,278.72/42,418.05 = 7,218.78/x
  3. Step 3: Cross multiply
    28,278.72x = 42,418.05 × 7,218.78
  4. Step 4: Simplify right side
    28,278.72x = 306,206,570.98
  5. Step 5: Solve for x
    x = 306,206,570.98/28,278.72
  6. Step 6: Final answer
    x = 10,828.16

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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.