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Finding the Fourth Proportional to 908.53, 1,253.48 and 628.81

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Solution

The fourth proportional to 908.53, 1,253.48 and 628.81 is: 867.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.53 : 1,253.48 = 628.81 : x
  2. Step 2: Convert to fraction form
    908.53/1,253.48 = 628.81/x
  3. Step 3: Cross multiply
    908.53x = 1,253.48 × 628.81
  4. Step 4: Simplify right side
    908.53x = 788,194.48
  5. Step 5: Solve for x
    x = 788,194.48/908.53
  6. Step 6: Final answer
    x = 867.55

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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.