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Finding the Fourth Proportional to 810.22, 1,215.40 and 262.48

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Solution

The fourth proportional to 810.22, 1,215.40 and 262.48 is: 393.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.22 : 1,215.40 = 262.48 : x
  2. Step 2: Convert to fraction form
    810.22/1,215.40 = 262.48/x
  3. Step 3: Cross multiply
    810.22x = 1,215.40 × 262.48
  4. Step 4: Simplify right side
    810.22x = 319,018.19
  5. Step 5: Solve for x
    x = 319,018.19/810.22
  6. Step 6: Final answer
    x = 393.74

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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.