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Finding the Fourth Proportional to 429.94, 643.95 and 307.83

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Solution

The fourth proportional to 429.94, 643.95 and 307.83 is: 461.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.94 : 643.95 = 307.83 : x
  2. Step 2: Convert to fraction form
    429.94/643.95 = 307.83/x
  3. Step 3: Cross multiply
    429.94x = 643.95 × 307.83
  4. Step 4: Simplify right side
    429.94x = 198,229.54
  5. Step 5: Solve for x
    x = 198,229.54/429.94
  6. Step 6: Final answer
    x = 461.06

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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.