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Finding the Fourth Proportional to 385.46, 578.12 and 238.98

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Solution

The fourth proportional to 385.46, 578.12 and 238.98 is: 358.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.46 : 578.12 = 238.98 : x
  2. Step 2: Convert to fraction form
    385.46/578.12 = 238.98/x
  3. Step 3: Cross multiply
    385.46x = 578.12 × 238.98
  4. Step 4: Simplify right side
    385.46x = 138,159.12
  5. Step 5: Solve for x
    x = 138,159.12/385.46
  6. Step 6: Final answer
    x = 358.43

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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.