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Finding the Fourth Proportional to 810.45, 1,215.79 and 262.69

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Solution

The fourth proportional to 810.45, 1,215.79 and 262.69 is: 394.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.45 : 1,215.79 = 262.69 : x
  2. Step 2: Convert to fraction form
    810.45/1,215.79 = 262.69/x
  3. Step 3: Cross multiply
    810.45x = 1,215.79 × 262.69
  4. Step 4: Simplify right side
    810.45x = 319,372.18
  5. Step 5: Solve for x
    x = 319,372.18/810.45
  6. Step 6: Final answer
    x = 394.07

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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.