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Finding the Fourth Proportional to 429.68, 645.64 and 234.80

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Solution

The fourth proportional to 429.68, 645.64 and 234.80 is: 352.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.68 : 645.64 = 234.80 : x
  2. Step 2: Convert to fraction form
    429.68/645.64 = 234.80/x
  3. Step 3: Cross multiply
    429.68x = 645.64 × 234.80
  4. Step 4: Simplify right side
    429.68x = 151,598.47
  5. Step 5: Solve for x
    x = 151,598.47/429.68
  6. Step 6: Final answer
    x = 352.82

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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.