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Finding the Fourth Proportional to 429.93, 641.43 and 409.32

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Solution

The fourth proportional to 429.93, 641.43 and 409.32 is: 610.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.93 : 641.43 = 409.32 : x
  2. Step 2: Convert to fraction form
    429.93/641.43 = 409.32/x
  3. Step 3: Cross multiply
    429.93x = 641.43 × 409.32
  4. Step 4: Simplify right side
    429.93x = 262,550.13
  5. Step 5: Solve for x
    x = 262,550.13/429.93
  6. Step 6: Final answer
    x = 610.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.