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Finding the Fourth Proportional to 429.86, 643.25 and 372.28

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Solution

The fourth proportional to 429.86, 643.25 and 372.28 is: 557.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.86 : 643.25 = 372.28 : x
  2. Step 2: Convert to fraction form
    429.86/643.25 = 372.28/x
  3. Step 3: Cross multiply
    429.86x = 643.25 × 372.28
  4. Step 4: Simplify right side
    429.86x = 239,467.25
  5. Step 5: Solve for x
    x = 239,467.25/429.86
  6. Step 6: Final answer
    x = 557.08

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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.