Home / 1,377.20-2,066.90-511.76

Finding the Fourth Proportional to 1,377.20, 2,066.90 and 511.76

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Solution

The fourth proportional to 1,377.20, 2,066.90 and 511.76 is: 768.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.20 : 2,066.90 = 511.76 : x
  2. Step 2: Convert to fraction form
    1,377.20/2,066.90 = 511.76/x
  3. Step 3: Cross multiply
    1,377.20x = 2,066.90 × 511.76
  4. Step 4: Simplify right side
    1,377.20x = 1,057,756.74
  5. Step 5: Solve for x
    x = 1,057,756.74/1,377.20
  6. Step 6: Final answer
    x = 768.05

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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.