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Finding the Fourth Proportional to 614.31, 921.36 and 285.15

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Solution

The fourth proportional to 614.31, 921.36 and 285.15 is: 427.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.31 : 921.36 = 285.15 : x
  2. Step 2: Convert to fraction form
    614.31/921.36 = 285.15/x
  3. Step 3: Cross multiply
    614.31x = 921.36 × 285.15
  4. Step 4: Simplify right side
    614.31x = 262,725.80
  5. Step 5: Solve for x
    x = 262,725.80/614.31
  6. Step 6: Final answer
    x = 427.68

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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.