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Finding the Fourth Proportional to 100.34, 150.39 and 74.51

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Solution

The fourth proportional to 100.34, 150.39 and 74.51 is: 111.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.34 : 150.39 = 74.51 : x
  2. Step 2: Convert to fraction form
    100.34/150.39 = 74.51/x
  3. Step 3: Cross multiply
    100.34x = 150.39 × 74.51
  4. Step 4: Simplify right side
    100.34x = 11,204.81
  5. Step 5: Solve for x
    x = 11,204.81/100.34
  6. Step 6: Final answer
    x = 111.67

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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.