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Finding the Fourth Proportional to 152.36, 209.76 and 139.04

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Solution

The fourth proportional to 152.36, 209.76 and 139.04 is: 191.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.36 : 209.76 = 139.04 : x
  2. Step 2: Convert to fraction form
    152.36/209.76 = 139.04/x
  3. Step 3: Cross multiply
    152.36x = 209.76 × 139.04
  4. Step 4: Simplify right side
    152.36x = 29,165.03
  5. Step 5: Solve for x
    x = 29,165.03/152.36
  6. Step 6: Final answer
    x = 191.42

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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.