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Finding the Fourth Proportional to 85.54, 128.24 and 61.50

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Solution

The fourth proportional to 85.54, 128.24 and 61.50 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.54 : 128.24 = 61.50 : x
  2. Step 2: Convert to fraction form
    85.54/128.24 = 61.50/x
  3. Step 3: Cross multiply
    85.54x = 128.24 × 61.50
  4. Step 4: Simplify right side
    85.54x = 7,886.76
  5. Step 5: Solve for x
    x = 7,886.76/85.54
  6. Step 6: Final answer
    x = 92.20

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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.