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Finding the Fourth Proportional to 128.42, 177.36 and 117.50

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Solution

The fourth proportional to 128.42, 177.36 and 117.50 is: 162.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.42 : 177.36 = 117.50 : x
  2. Step 2: Convert to fraction form
    128.42/177.36 = 117.50/x
  3. Step 3: Cross multiply
    128.42x = 177.36 × 117.50
  4. Step 4: Simplify right side
    128.42x = 20,839.80
  5. Step 5: Solve for x
    x = 20,839.80/128.42
  6. Step 6: Final answer
    x = 162.28

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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.