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Finding the Fourth Proportional to 88.24, 131.56 and 85.92

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Solution

The fourth proportional to 88.24, 131.56 and 85.92 is: 128.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.24 : 131.56 = 85.92 : x
  2. Step 2: Convert to fraction form
    88.24/131.56 = 85.92/x
  3. Step 3: Cross multiply
    88.24x = 131.56 × 85.92
  4. Step 4: Simplify right side
    88.24x = 11,303.64
  5. Step 5: Solve for x
    x = 11,303.64/88.24
  6. Step 6: Final answer
    x = 128.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.