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Finding the Fourth Proportional to 429.28, 643.20 and 374.56

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Solution

The fourth proportional to 429.28, 643.20 and 374.56 is: 561.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.28 : 643.20 = 374.56 : x
  2. Step 2: Convert to fraction form
    429.28/643.20 = 374.56/x
  3. Step 3: Cross multiply
    429.28x = 643.20 × 374.56
  4. Step 4: Simplify right side
    429.28x = 240,916.99
  5. Step 5: Solve for x
    x = 240,916.99/429.28
  6. Step 6: Final answer
    x = 561.21

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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.