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Finding the Fourth Proportional to 91.74, 137.64 and 42.99

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Solution

The fourth proportional to 91.74, 137.64 and 42.99 is: 64.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.74 : 137.64 = 42.99 : x
  2. Step 2: Convert to fraction form
    91.74/137.64 = 42.99/x
  3. Step 3: Cross multiply
    91.74x = 137.64 × 42.99
  4. Step 4: Simplify right side
    91.74x = 5,917.14
  5. Step 5: Solve for x
    x = 5,917.14/91.74
  6. Step 6: Final answer
    x = 64.50

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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.