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Finding the Fourth Proportional to 385.47, 578.18 and 111.55

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Solution

The fourth proportional to 385.47, 578.18 and 111.55 is: 167.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.47 : 578.18 = 111.55 : x
  2. Step 2: Convert to fraction form
    385.47/578.18 = 111.55/x
  3. Step 3: Cross multiply
    385.47x = 578.18 × 111.55
  4. Step 4: Simplify right side
    385.47x = 64,497.15
  5. Step 5: Solve for x
    x = 64,497.15/385.47
  6. Step 6: Final answer
    x = 167.32

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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.