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Finding the Fourth Proportional to 172, 236.64 and 128.16

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Solution

The fourth proportional to 172, 236.64 and 128.16 is: 176.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172 : 236.64 = 128.16 : x
  2. Step 2: Convert to fraction form
    172/236.64 = 128.16/x
  3. Step 3: Cross multiply
    172x = 236.64 × 128.16
  4. Step 4: Simplify right side
    172x = 30,327.78
  5. Step 5: Solve for x
    x = 30,327.78/172
  6. Step 6: Final answer
    x = 176.32

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1.5x scale

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.