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Finding the Fourth Proportional to 177.81, 245.69 and 128.60

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Solution

The fourth proportional to 177.81, 245.69 and 128.60 is: 177.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.81 : 245.69 = 128.60 : x
  2. Step 2: Convert to fraction form
    177.81/245.69 = 128.60/x
  3. Step 3: Cross multiply
    177.81x = 245.69 × 128.60
  4. Step 4: Simplify right side
    177.81x = 31,596.19
  5. Step 5: Solve for x
    x = 31,596.19/177.81
  6. Step 6: Final answer
    x = 177.70

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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.