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Finding the Fourth Proportional to 385.16, 578.01 and 141.68

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Solution

The fourth proportional to 385.16, 578.01 and 141.68 is: 212.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.16 : 578.01 = 141.68 : x
  2. Step 2: Convert to fraction form
    385.16/578.01 = 141.68/x
  3. Step 3: Cross multiply
    385.16x = 578.01 × 141.68
  4. Step 4: Simplify right side
    385.16x = 81,892.46
  5. Step 5: Solve for x
    x = 81,892.46/385.16
  6. Step 6: Final answer
    x = 212.62

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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.