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Finding the Fourth Proportional to 145.40, 217.08 and 143.88

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Solution

The fourth proportional to 145.40, 217.08 and 143.88 is: 214.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.40 : 217.08 = 143.88 : x
  2. Step 2: Convert to fraction form
    145.40/217.08 = 143.88/x
  3. Step 3: Cross multiply
    145.40x = 217.08 × 143.88
  4. Step 4: Simplify right side
    145.40x = 31,233.47
  5. Step 5: Solve for x
    x = 31,233.47/145.40
  6. Step 6: Final answer
    x = 214.81

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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.