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Finding the Fourth Proportional to 177.66, 245.16 and 128.45

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Solution

The fourth proportional to 177.66, 245.16 and 128.45 is: 177.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.66 : 245.16 = 128.45 : x
  2. Step 2: Convert to fraction form
    177.66/245.16 = 128.45/x
  3. Step 3: Cross multiply
    177.66x = 245.16 × 128.45
  4. Step 4: Simplify right side
    177.66x = 31,489.71
  5. Step 5: Solve for x
    x = 31,489.71/177.66
  6. Step 6: Final answer
    x = 177.25

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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.