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Finding the Fourth Proportional to 101.99, 140.87 and 101.31

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Solution

The fourth proportional to 101.99, 140.87 and 101.31 is: 139.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.99 : 140.87 = 101.31 : x
  2. Step 2: Convert to fraction form
    101.99/140.87 = 101.31/x
  3. Step 3: Cross multiply
    101.99x = 140.87 × 101.31
  4. Step 4: Simplify right side
    101.99x = 14,271.03
  5. Step 5: Solve for x
    x = 14,271.03/101.99
  6. Step 6: Final answer
    x = 139.93

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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.