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Finding the Fourth Proportional to 810.19, 1,215.28 and 262.39

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Solution

The fourth proportional to 810.19, 1,215.28 and 262.39 is: 393.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.19 : 1,215.28 = 262.39 : x
  2. Step 2: Convert to fraction form
    810.19/1,215.28 = 262.39/x
  3. Step 3: Cross multiply
    810.19x = 1,215.28 × 262.39
  4. Step 4: Simplify right side
    810.19x = 318,877.32
  5. Step 5: Solve for x
    x = 318,877.32/810.19
  6. Step 6: Final answer
    x = 393.58

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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.