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Finding the Fourth Proportional to 145.49, 218.15 and 68.42

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Solution

The fourth proportional to 145.49, 218.15 and 68.42 is: 102.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.49 : 218.15 = 68.42 : x
  2. Step 2: Convert to fraction form
    145.49/218.15 = 68.42/x
  3. Step 3: Cross multiply
    145.49x = 218.15 × 68.42
  4. Step 4: Simplify right side
    145.49x = 14,924.39
  5. Step 5: Solve for x
    x = 14,924.39/145.49
  6. Step 6: Final answer
    x = 102.58

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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.