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Finding the Fourth Proportional to 100.47, 150.72 and 70.11

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Solution

The fourth proportional to 100.47, 150.72 and 70.11 is: 105.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.47 : 150.72 = 70.11 : x
  2. Step 2: Convert to fraction form
    100.47/150.72 = 70.11/x
  3. Step 3: Cross multiply
    100.47x = 150.72 × 70.11
  4. Step 4: Simplify right side
    100.47x = 10,566.98
  5. Step 5: Solve for x
    x = 10,566.98/100.47
  6. Step 6: Final answer
    x = 105.18

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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.