Home / 2,077.80-3,115.40-690.78

Finding the Fourth Proportional to 2,077.80, 3,115.40 and 690.78

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Solution

The fourth proportional to 2,077.80, 3,115.40 and 690.78 is: 1,035.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,077.80 : 3,115.40 = 690.78 : x
  2. Step 2: Convert to fraction form
    2,077.80/3,115.40 = 690.78/x
  3. Step 3: Cross multiply
    2,077.80x = 3,115.40 × 690.78
  4. Step 4: Simplify right side
    2,077.80x = 2,152,057.74
  5. Step 5: Solve for x
    x = 2,152,057.74/2,077.80
  6. Step 6: Final answer
    x = 1,035.74

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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.