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Finding the Fourth Proportional to 429.26, 643.42 and 314.19

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Solution

The fourth proportional to 429.26, 643.42 and 314.19 is: 470.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.26 : 643.42 = 314.19 : x
  2. Step 2: Convert to fraction form
    429.26/643.42 = 314.19/x
  3. Step 3: Cross multiply
    429.26x = 643.42 × 314.19
  4. Step 4: Simplify right side
    429.26x = 202,155.34
  5. Step 5: Solve for x
    x = 202,155.34/429.26
  6. Step 6: Final answer
    x = 470.94

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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.