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Finding the Fourth Proportional to 146.16, 216.72 and 143.40

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Solution

The fourth proportional to 146.16, 216.72 and 143.40 is: 212.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.16 : 216.72 = 143.40 : x
  2. Step 2: Convert to fraction form
    146.16/216.72 = 143.40/x
  3. Step 3: Cross multiply
    146.16x = 216.72 × 143.40
  4. Step 4: Simplify right side
    146.16x = 31,077.65
  5. Step 5: Solve for x
    x = 31,077.65/146.16
  6. Step 6: Final answer
    x = 212.63

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.