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Finding the Fourth Proportional to 136.51, 188.38 and 77.48

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Solution

The fourth proportional to 136.51, 188.38 and 77.48 is: 106.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.51 : 188.38 = 77.48 : x
  2. Step 2: Convert to fraction form
    136.51/188.38 = 77.48/x
  3. Step 3: Cross multiply
    136.51x = 188.38 × 77.48
  4. Step 4: Simplify right side
    136.51x = 14,595.64
  5. Step 5: Solve for x
    x = 14,595.64/136.51
  6. Step 6: Final answer
    x = 106.92

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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.