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Finding the Fourth Proportional to 810.67, 1,215.78 and 262.78

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Solution

The fourth proportional to 810.67, 1,215.78 and 262.78 is: 394.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.67 : 1,215.78 = 262.78 : x
  2. Step 2: Convert to fraction form
    810.67/1,215.78 = 262.78/x
  3. Step 3: Cross multiply
    810.67x = 1,215.78 × 262.78
  4. Step 4: Simplify right side
    810.67x = 319,484.33
  5. Step 5: Solve for x
    x = 319,484.33/810.67
  6. Step 6: Final answer
    x = 394.10

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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.