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Finding the Fourth Proportional to 144.12, 216.15 and 57.43

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Solution

The fourth proportional to 144.12, 216.15 and 57.43 is: 86.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.12 : 216.15 = 57.43 : x
  2. Step 2: Convert to fraction form
    144.12/216.15 = 57.43/x
  3. Step 3: Cross multiply
    144.12x = 216.15 × 57.43
  4. Step 4: Simplify right side
    144.12x = 12,413.49
  5. Step 5: Solve for x
    x = 12,413.49/144.12
  6. Step 6: Final answer
    x = 86.13

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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.