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Finding the Fourth Proportional to 91.04, 124.48 and 87.68

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Solution

The fourth proportional to 91.04, 124.48 and 87.68 is: 119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.04 : 124.48 = 87.68 : x
  2. Step 2: Convert to fraction form
    91.04/124.48 = 87.68/x
  3. Step 3: Cross multiply
    91.04x = 124.48 × 87.68
  4. Step 4: Simplify right side
    91.04x = 10,914.41
  5. Step 5: Solve for x
    x = 10,914.41/91.04
  6. Step 6: Final answer
    x = 119.89

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.