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Finding the Fourth Proportional to 429.86, 644.80 and 258.50

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Solution

The fourth proportional to 429.86, 644.80 and 258.50 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.86 : 644.80 = 258.50 : x
  2. Step 2: Convert to fraction form
    429.86/644.80 = 258.50/x
  3. Step 3: Cross multiply
    429.86x = 644.80 × 258.50
  4. Step 4: Simplify right side
    429.86x = 166,680.80
  5. Step 5: Solve for x
    x = 166,680.80/429.86
  6. Step 6: Final answer
    x = 387.76

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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.