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Finding the Fourth Proportional to 429.63, 645.65 and 256.32

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Solution

The fourth proportional to 429.63, 645.65 and 256.32 is: 385.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.63 : 645.65 = 256.32 : x
  2. Step 2: Convert to fraction form
    429.63/645.65 = 256.32/x
  3. Step 3: Cross multiply
    429.63x = 645.65 × 256.32
  4. Step 4: Simplify right side
    429.63x = 165,491.73
  5. Step 5: Solve for x
    x = 165,491.73/429.63
  6. Step 6: Final answer
    x = 385.20

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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.