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Finding the Fourth Proportional to 908.79, 1,364.58 and 871.35

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Solution

The fourth proportional to 908.79, 1,364.58 and 871.35 is: 1,308.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.79 : 1,364.58 = 871.35 : x
  2. Step 2: Convert to fraction form
    908.79/1,364.58 = 871.35/x
  3. Step 3: Cross multiply
    908.79x = 1,364.58 × 871.35
  4. Step 4: Simplify right side
    908.79x = 1,189,026.78
  5. Step 5: Solve for x
    x = 1,189,026.78/908.79
  6. Step 6: Final answer
    x = 1,308.36

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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.