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Finding the Fourth Proportional to 385.86, 578.90 and 299.28

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Solution

The fourth proportional to 385.86, 578.90 and 299.28 is: 449.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.86 : 578.90 = 299.28 : x
  2. Step 2: Convert to fraction form
    385.86/578.90 = 299.28/x
  3. Step 3: Cross multiply
    385.86x = 578.90 × 299.28
  4. Step 4: Simplify right side
    385.86x = 173,251.70
  5. Step 5: Solve for x
    x = 173,251.70/385.86
  6. Step 6: Final answer
    x = 449.00

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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.