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Finding the Fourth Proportional to 139.15, 191.91 and 90.03

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Solution

The fourth proportional to 139.15, 191.91 and 90.03 is: 124.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.15 : 191.91 = 90.03 : x
  2. Step 2: Convert to fraction form
    139.15/191.91 = 90.03/x
  3. Step 3: Cross multiply
    139.15x = 191.91 × 90.03
  4. Step 4: Simplify right side
    139.15x = 17,276.70
  5. Step 5: Solve for x
    x = 17,276.70/139.15
  6. Step 6: Final answer
    x = 124.16

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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.