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Finding the Fourth Proportional to 810.84, 1,215.12 and 627.39

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Solution

The fourth proportional to 810.84, 1,215.12 and 627.39 is: 940.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.84 : 1,215.12 = 627.39 : x
  2. Step 2: Convert to fraction form
    810.84/1,215.12 = 627.39/x
  3. Step 3: Cross multiply
    810.84x = 1,215.12 × 627.39
  4. Step 4: Simplify right side
    810.84x = 762,354.14
  5. Step 5: Solve for x
    x = 762,354.14/810.84
  6. Step 6: Final answer
    x = 940.20

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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.