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Finding the Fourth Proportional to 934.91, 1,287.11 and 810.17

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Solution

The fourth proportional to 934.91, 1,287.11 and 810.17 is: 1,115.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.91 : 1,287.11 = 810.17 : x
  2. Step 2: Convert to fraction form
    934.91/1,287.11 = 810.17/x
  3. Step 3: Cross multiply
    934.91x = 1,287.11 × 810.17
  4. Step 4: Simplify right side
    934.91x = 1,042,777.91
  5. Step 5: Solve for x
    x = 1,042,777.91/934.91
  6. Step 6: Final answer
    x = 1,115.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.