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Finding the Fourth Proportional to 810.57, 1,215.55 and 262.61

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Solution

The fourth proportional to 810.57, 1,215.55 and 262.61 is: 393.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.57 : 1,215.55 = 262.61 : x
  2. Step 2: Convert to fraction form
    810.57/1,215.55 = 262.61/x
  3. Step 3: Cross multiply
    810.57x = 1,215.55 × 262.61
  4. Step 4: Simplify right side
    810.57x = 319,209.84
  5. Step 5: Solve for x
    x = 319,209.84/810.57
  6. Step 6: Final answer
    x = 393.81

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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.