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Finding the Fourth Proportional to 101.23, 139.76 and 72.07

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Solution

The fourth proportional to 101.23, 139.76 and 72.07 is: 99.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.23 : 139.76 = 72.07 : x
  2. Step 2: Convert to fraction form
    101.23/139.76 = 72.07/x
  3. Step 3: Cross multiply
    101.23x = 139.76 × 72.07
  4. Step 4: Simplify right side
    101.23x = 10,072.06
  5. Step 5: Solve for x
    x = 10,072.06/101.23
  6. Step 6: Final answer
    x = 99.50

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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.