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Finding the Fourth Proportional to 149.03, 205.15 and 128.18

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Solution

The fourth proportional to 149.03, 205.15 and 128.18 is: 176.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.03 : 205.15 = 128.18 : x
  2. Step 2: Convert to fraction form
    149.03/205.15 = 128.18/x
  3. Step 3: Cross multiply
    149.03x = 205.15 × 128.18
  4. Step 4: Simplify right side
    149.03x = 26,296.13
  5. Step 5: Solve for x
    x = 26,296.13/149.03
  6. Step 6: Final answer
    x = 176.45

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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.