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Finding the Fourth Proportional to 128.48, 177.31 and 70.27

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Solution

The fourth proportional to 128.48, 177.31 and 70.27 is: 96.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 177.31 = 70.27 : x
  2. Step 2: Convert to fraction form
    128.48/177.31 = 70.27/x
  3. Step 3: Cross multiply
    128.48x = 177.31 × 70.27
  4. Step 4: Simplify right side
    128.48x = 12,459.57
  5. Step 5: Solve for x
    x = 12,459.57/128.48
  6. Step 6: Final answer
    x = 96.98

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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.