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Finding the Fourth Proportional to 154.68, 213.47 and 89.19

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Solution

The fourth proportional to 154.68, 213.47 and 89.19 is: 123.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.68 : 213.47 = 89.19 : x
  2. Step 2: Convert to fraction form
    154.68/213.47 = 89.19/x
  3. Step 3: Cross multiply
    154.68x = 213.47 × 89.19
  4. Step 4: Simplify right side
    154.68x = 19,039.39
  5. Step 5: Solve for x
    x = 19,039.39/154.68
  6. Step 6: Final answer
    x = 123.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.