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Finding the Fourth Proportional to 429.04, 643.70 and 136.59

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Solution

The fourth proportional to 429.04, 643.70 and 136.59 is: 204.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.04 : 643.70 = 136.59 : x
  2. Step 2: Convert to fraction form
    429.04/643.70 = 136.59/x
  3. Step 3: Cross multiply
    429.04x = 643.70 × 136.59
  4. Step 4: Simplify right side
    429.04x = 87,923.32
  5. Step 5: Solve for x
    x = 87,923.32/429.04
  6. Step 6: Final answer
    x = 204.93

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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.