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Finding the Fourth Proportional to 100.19, 150.30 and 72.86

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Solution

The fourth proportional to 100.19, 150.30 and 72.86 is: 109.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.19 : 150.30 = 72.86 : x
  2. Step 2: Convert to fraction form
    100.19/150.30 = 72.86/x
  3. Step 3: Cross multiply
    100.19x = 150.30 × 72.86
  4. Step 4: Simplify right side
    100.19x = 10,950.11
  5. Step 5: Solve for x
    x = 10,950.11/100.19
  6. Step 6: Final answer
    x = 109.29

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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.