Home / 28,139.15-42,208.70-11,279.78

Finding the Fourth Proportional to 28,139.15, 42,208.70 and 11,279.78

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Solution

The fourth proportional to 28,139.15, 42,208.70 and 11,279.78 is: 16,919.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.15 : 42,208.70 = 11,279.78 : x
  2. Step 2: Convert to fraction form
    28,139.15/42,208.70 = 11,279.78/x
  3. Step 3: Cross multiply
    28,139.15x = 42,208.70 × 11,279.78
  4. Step 4: Simplify right side
    28,139.15x = 476,104,582.64
  5. Step 5: Solve for x
    x = 476,104,582.64/28,139.15
  6. Step 6: Final answer
    x = 16,919.65

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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.