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Finding the Fourth Proportional to 910.66, 1,366.21 and 261.39

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Solution

The fourth proportional to 910.66, 1,366.21 and 261.39 is: 392.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.66 : 1,366.21 = 261.39 : x
  2. Step 2: Convert to fraction form
    910.66/1,366.21 = 261.39/x
  3. Step 3: Cross multiply
    910.66x = 1,366.21 × 261.39
  4. Step 4: Simplify right side
    910.66x = 357,105.49
  5. Step 5: Solve for x
    x = 357,105.49/910.66
  6. Step 6: Final answer
    x = 392.14

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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.