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Finding the Fourth Proportional to 88.13, 131.47 and 85.65

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Solution

The fourth proportional to 88.13, 131.47 and 85.65 is: 127.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.13 : 131.47 = 85.65 : x
  2. Step 2: Convert to fraction form
    88.13/131.47 = 85.65/x
  3. Step 3: Cross multiply
    88.13x = 131.47 × 85.65
  4. Step 4: Simplify right side
    88.13x = 11,260.41
  5. Step 5: Solve for x
    x = 11,260.41/88.13
  6. Step 6: Final answer
    x = 127.77

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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.