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Finding the Fourth Proportional to 100.94, 151.28 and 70.56

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Solution

The fourth proportional to 100.94, 151.28 and 70.56 is: 105.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.94 : 151.28 = 70.56 : x
  2. Step 2: Convert to fraction form
    100.94/151.28 = 70.56/x
  3. Step 3: Cross multiply
    100.94x = 151.28 × 70.56
  4. Step 4: Simplify right side
    100.94x = 10,673.96
  5. Step 5: Solve for x
    x = 10,673.96/100.94
  6. Step 6: Final answer
    x = 105.75

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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.