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Finding the Fourth Proportional to 139.36, 210.12 and 130.08

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Solution

The fourth proportional to 139.36, 210.12 and 130.08 is: 196.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.36 : 210.12 = 130.08 : x
  2. Step 2: Convert to fraction form
    139.36/210.12 = 130.08/x
  3. Step 3: Cross multiply
    139.36x = 210.12 × 130.08
  4. Step 4: Simplify right side
    139.36x = 27,332.41
  5. Step 5: Solve for x
    x = 27,332.41/139.36
  6. Step 6: Final answer
    x = 196.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.