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Finding the Fourth Proportional to 145.97, 217.29 and 139.33

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Solution

The fourth proportional to 145.97, 217.29 and 139.33 is: 207.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.97 : 217.29 = 139.33 : x
  2. Step 2: Convert to fraction form
    145.97/217.29 = 139.33/x
  3. Step 3: Cross multiply
    145.97x = 217.29 × 139.33
  4. Step 4: Simplify right side
    145.97x = 30,275.81
  5. Step 5: Solve for x
    x = 30,275.81/145.97
  6. Step 6: Final answer
    x = 207.41

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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.