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Finding the Fourth Proportional to 186.48, 257.05 and 128.16

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Solution

The fourth proportional to 186.48, 257.05 and 128.16 is: 176.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.48 : 257.05 = 128.16 : x
  2. Step 2: Convert to fraction form
    186.48/257.05 = 128.16/x
  3. Step 3: Cross multiply
    186.48x = 257.05 × 128.16
  4. Step 4: Simplify right side
    186.48x = 32,943.53
  5. Step 5: Solve for x
    x = 32,943.53/186.48
  6. Step 6: Final answer
    x = 176.66

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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.