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Finding the Fourth Proportional to 145.69, 218.20 and 115.17

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Solution

The fourth proportional to 145.69, 218.20 and 115.17 is: 172.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.69 : 218.20 = 115.17 : x
  2. Step 2: Convert to fraction form
    145.69/218.20 = 115.17/x
  3. Step 3: Cross multiply
    145.69x = 218.20 × 115.17
  4. Step 4: Simplify right side
    145.69x = 25,130.09
  5. Step 5: Solve for x
    x = 25,130.09/145.69
  6. Step 6: Final answer
    x = 172.49

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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.