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Finding the Fourth Proportional to 385.48, 578.40 and 142.16

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Solution

The fourth proportional to 385.48, 578.40 and 142.16 is: 213.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 578.40 = 142.16 : x
  2. Step 2: Convert to fraction form
    385.48/578.40 = 142.16/x
  3. Step 3: Cross multiply
    385.48x = 578.40 × 142.16
  4. Step 4: Simplify right side
    385.48x = 82,225.34
  5. Step 5: Solve for x
    x = 82,225.34/385.48
  6. Step 6: Final answer
    x = 213.31

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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.