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Finding the Fourth Proportional to 188.36, 282.47 and 85.70

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Solution

The fourth proportional to 188.36, 282.47 and 85.70 is: 128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.36 : 282.47 = 85.70 : x
  2. Step 2: Convert to fraction form
    188.36/282.47 = 85.70/x
  3. Step 3: Cross multiply
    188.36x = 282.47 × 85.70
  4. Step 4: Simplify right side
    188.36x = 24,205.84
  5. Step 5: Solve for x
    x = 24,205.84/188.36
  6. Step 6: Final answer
    x = 128.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.