Home / 2,780.38-4,167.60-929.80

Finding the Fourth Proportional to 2,780.38, 4,167.60 and 929.80

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Solution

The fourth proportional to 2,780.38, 4,167.60 and 929.80 is: 1,393.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.38 : 4,167.60 = 929.80 : x
  2. Step 2: Convert to fraction form
    2,780.38/4,167.60 = 929.80/x
  3. Step 3: Cross multiply
    2,780.38x = 4,167.60 × 929.80
  4. Step 4: Simplify right side
    2,780.38x = 3,875,034.48
  5. Step 5: Solve for x
    x = 3,875,034.48/2,780.38
  6. Step 6: Final answer
    x = 1,393.71

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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.