Home / 2,780.07-4,170.15-931.20

Finding the Fourth Proportional to 2,780.07, 4,170.15 and 931.20

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Solution

The fourth proportional to 2,780.07, 4,170.15 and 931.20 is: 1,396.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.07 : 4,170.15 = 931.20 : x
  2. Step 2: Convert to fraction form
    2,780.07/4,170.15 = 931.20/x
  3. Step 3: Cross multiply
    2,780.07x = 4,170.15 × 931.20
  4. Step 4: Simplify right side
    2,780.07x = 3,883,243.68
  5. Step 5: Solve for x
    x = 3,883,243.68/2,780.07
  6. Step 6: Final answer
    x = 1,396.82

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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.