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Finding the Fourth Proportional to 908.82, 1,356.70 and 868.93

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Solution

The fourth proportional to 908.82, 1,356.70 and 868.93 is: 1,297.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.82 : 1,356.70 = 868.93 : x
  2. Step 2: Convert to fraction form
    908.82/1,356.70 = 868.93/x
  3. Step 3: Cross multiply
    908.82x = 1,356.70 × 868.93
  4. Step 4: Simplify right side
    908.82x = 1,178,877.33
  5. Step 5: Solve for x
    x = 1,178,877.33/908.82
  6. Step 6: Final answer
    x = 1,297.15

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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.