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Finding the Fourth Proportional to 429.65, 644.30 and 186.20

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Solution

The fourth proportional to 429.65, 644.30 and 186.20 is: 279.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.65 : 644.30 = 186.20 : x
  2. Step 2: Convert to fraction form
    429.65/644.30 = 186.20/x
  3. Step 3: Cross multiply
    429.65x = 644.30 × 186.20
  4. Step 4: Simplify right side
    429.65x = 119,968.67
  5. Step 5: Solve for x
    x = 119,968.67/429.65
  6. Step 6: Final answer
    x = 279.22

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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.