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Finding the Fourth Proportional to 871.93, 1,308.35 and 385.31

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Solution

The fourth proportional to 871.93, 1,308.35 and 385.31 is: 578.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.93 : 1,308.35 = 385.31 : x
  2. Step 2: Convert to fraction form
    871.93/1,308.35 = 385.31/x
  3. Step 3: Cross multiply
    871.93x = 1,308.35 × 385.31
  4. Step 4: Simplify right side
    871.93x = 504,120.34
  5. Step 5: Solve for x
    x = 504,120.34/871.93
  6. Step 6: Final answer
    x = 578.17

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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.