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Finding the Fourth Proportional to 139.16, 207.58 and 127.48

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Solution

The fourth proportional to 139.16, 207.58 and 127.48 is: 190.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.16 : 207.58 = 127.48 : x
  2. Step 2: Convert to fraction form
    139.16/207.58 = 127.48/x
  3. Step 3: Cross multiply
    139.16x = 207.58 × 127.48
  4. Step 4: Simplify right side
    139.16x = 26,462.30
  5. Step 5: Solve for x
    x = 26,462.30/139.16
  6. Step 6: Final answer
    x = 190.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.