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Finding the Fourth Proportional to 101.51, 139.91 and 98.94

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Solution

The fourth proportional to 101.51, 139.91 and 98.94 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.51 : 139.91 = 98.94 : x
  2. Step 2: Convert to fraction form
    101.51/139.91 = 98.94/x
  3. Step 3: Cross multiply
    101.51x = 139.91 × 98.94
  4. Step 4: Simplify right side
    101.51x = 13,842.20
  5. Step 5: Solve for x
    x = 13,842.20/101.51
  6. Step 6: Final answer
    x = 136.37

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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.