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Finding the Fourth Proportional to 810.22, 1,215.30 and 262.40

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Solution

The fourth proportional to 810.22, 1,215.30 and 262.40 is: 393.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.22 : 1,215.30 = 262.40 : x
  2. Step 2: Convert to fraction form
    810.22/1,215.30 = 262.40/x
  3. Step 3: Cross multiply
    810.22x = 1,215.30 × 262.40
  4. Step 4: Simplify right side
    810.22x = 318,894.72
  5. Step 5: Solve for x
    x = 318,894.72/810.22
  6. Step 6: Final answer
    x = 393.59

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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.