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Finding the Fourth Proportional to 429.33, 643.99 and 104.70

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Solution

The fourth proportional to 429.33, 643.99 and 104.70 is: 157.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.33 : 643.99 = 104.70 : x
  2. Step 2: Convert to fraction form
    429.33/643.99 = 104.70/x
  3. Step 3: Cross multiply
    429.33x = 643.99 × 104.70
  4. Step 4: Simplify right side
    429.33x = 67,422.53
  5. Step 5: Solve for x
    x = 67,422.53/429.33
  6. Step 6: Final answer
    x = 157.04

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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.