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Finding the Fourth Proportional to 429.90, 645.06 and 156.06

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Solution

The fourth proportional to 429.90, 645.06 and 156.06 is: 234.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.90 : 645.06 = 156.06 : x
  2. Step 2: Convert to fraction form
    429.90/645.06 = 156.06/x
  3. Step 3: Cross multiply
    429.90x = 645.06 × 156.06
  4. Step 4: Simplify right side
    429.90x = 100,668.06
  5. Step 5: Solve for x
    x = 100,668.06/429.90
  6. Step 6: Final answer
    x = 234.17

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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.