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Finding the Fourth Proportional to 99.95, 137.99 and 75.50

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Solution

The fourth proportional to 99.95, 137.99 and 75.50 is: 104.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.95 : 137.99 = 75.50 : x
  2. Step 2: Convert to fraction form
    99.95/137.99 = 75.50/x
  3. Step 3: Cross multiply
    99.95x = 137.99 × 75.50
  4. Step 4: Simplify right side
    99.95x = 10,417.84
  5. Step 5: Solve for x
    x = 10,417.84/99.95
  6. Step 6: Final answer
    x = 104.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.