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Finding the Fourth Proportional to 691.02, 1,036.62 and 300.78

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Solution

The fourth proportional to 691.02, 1,036.62 and 300.78 is: 451.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.02 : 1,036.62 = 300.78 : x
  2. Step 2: Convert to fraction form
    691.02/1,036.62 = 300.78/x
  3. Step 3: Cross multiply
    691.02x = 1,036.62 × 300.78
  4. Step 4: Simplify right side
    691.02x = 311,794.56
  5. Step 5: Solve for x
    x = 311,794.56/691.02
  6. Step 6: Final answer
    x = 451.21

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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.