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Finding the Fourth Proportional to 458.32, 687.78 and 427.95

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Solution

The fourth proportional to 458.32, 687.78 and 427.95 is: 642.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.32 : 687.78 = 427.95 : x
  2. Step 2: Convert to fraction form
    458.32/687.78 = 427.95/x
  3. Step 3: Cross multiply
    458.32x = 687.78 × 427.95
  4. Step 4: Simplify right side
    458.32x = 294,335.45
  5. Step 5: Solve for x
    x = 294,335.45/458.32
  6. Step 6: Final answer
    x = 642.21

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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.