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Finding the Fourth Proportional to 1,377.38, 2,066.99 and 511.70

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Solution

The fourth proportional to 1,377.38, 2,066.99 and 511.70 is: 767.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.38 : 2,066.99 = 511.70 : x
  2. Step 2: Convert to fraction form
    1,377.38/2,066.99 = 511.70/x
  3. Step 3: Cross multiply
    1,377.38x = 2,066.99 × 511.70
  4. Step 4: Simplify right side
    1,377.38x = 1,057,678.78
  5. Step 5: Solve for x
    x = 1,057,678.78/1,377.38
  6. Step 6: Final answer
    x = 767.89

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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.