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Finding the Fourth Proportional to 145.80, 217.70 and 144.42

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Solution

The fourth proportional to 145.80, 217.70 and 144.42 is: 215.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.80 : 217.70 = 144.42 : x
  2. Step 2: Convert to fraction form
    145.80/217.70 = 144.42/x
  3. Step 3: Cross multiply
    145.80x = 217.70 × 144.42
  4. Step 4: Simplify right side
    145.80x = 31,439.51
  5. Step 5: Solve for x
    x = 31,439.51/145.80
  6. Step 6: Final answer
    x = 215.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.