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Finding the Fourth Proportional to 139.93, 210.21 and 119.91

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Solution

The fourth proportional to 139.93, 210.21 and 119.91 is: 180.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.93 : 210.21 = 119.91 : x
  2. Step 2: Convert to fraction form
    139.93/210.21 = 119.91/x
  3. Step 3: Cross multiply
    139.93x = 210.21 × 119.91
  4. Step 4: Simplify right side
    139.93x = 25,206.28
  5. Step 5: Solve for x
    x = 25,206.28/139.93
  6. Step 6: Final answer
    x = 180.13

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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.