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Finding the Fourth Proportional to 385.48, 578.36 and 142

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Solution

The fourth proportional to 385.48, 578.36 and 142 is: 213.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 578.36 = 142 : x
  2. Step 2: Convert to fraction form
    385.48/578.36 = 142/x
  3. Step 3: Cross multiply
    385.48x = 578.36 × 142
  4. Step 4: Simplify right side
    385.48x = 82,127.12
  5. Step 5: Solve for x
    x = 82,127.12/385.48
  6. Step 6: Final answer
    x = 213.05

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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.