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Finding the Fourth Proportional to 139.08, 208.45 and 98.51

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Solution

The fourth proportional to 139.08, 208.45 and 98.51 is: 147.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.08 : 208.45 = 98.51 : x
  2. Step 2: Convert to fraction form
    139.08/208.45 = 98.51/x
  3. Step 3: Cross multiply
    139.08x = 208.45 × 98.51
  4. Step 4: Simplify right side
    139.08x = 20,533.92
  5. Step 5: Solve for x
    x = 20,533.92/139.08
  6. Step 6: Final answer
    x = 147.64

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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.