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Finding the Fourth Proportional to 908.28, 1,355.31 and 816.35

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Solution

The fourth proportional to 908.28, 1,355.31 and 816.35 is: 1,218.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.28 : 1,355.31 = 816.35 : x
  2. Step 2: Convert to fraction form
    908.28/1,355.31 = 816.35/x
  3. Step 3: Cross multiply
    908.28x = 1,355.31 × 816.35
  4. Step 4: Simplify right side
    908.28x = 1,106,400.54
  5. Step 5: Solve for x
    x = 1,106,400.54/908.28
  6. Step 6: Final answer
    x = 1,218.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.