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Finding the Fourth Proportional to 150.45, 207.47 and 128.32

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Solution

The fourth proportional to 150.45, 207.47 and 128.32 is: 176.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.45 : 207.47 = 128.32 : x
  2. Step 2: Convert to fraction form
    150.45/207.47 = 128.32/x
  3. Step 3: Cross multiply
    150.45x = 207.47 × 128.32
  4. Step 4: Simplify right side
    150.45x = 26,622.55
  5. Step 5: Solve for x
    x = 26,622.55/150.45
  6. Step 6: Final answer
    x = 176.95

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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.