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Finding the Fourth Proportional to 154.13, 212.75 and 88.68

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Solution

The fourth proportional to 154.13, 212.75 and 88.68 is: 122.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.13 : 212.75 = 88.68 : x
  2. Step 2: Convert to fraction form
    154.13/212.75 = 88.68/x
  3. Step 3: Cross multiply
    154.13x = 212.75 × 88.68
  4. Step 4: Simplify right side
    154.13x = 18,866.23
  5. Step 5: Solve for x
    x = 18,866.23/154.13
  6. Step 6: Final answer
    x = 122.40

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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.