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Finding the Fourth Proportional to 99.45, 137.87 and 93.98

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Solution

The fourth proportional to 99.45, 137.87 and 93.98 is: 130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.45 : 137.87 = 93.98 : x
  2. Step 2: Convert to fraction form
    99.45/137.87 = 93.98/x
  3. Step 3: Cross multiply
    99.45x = 137.87 × 93.98
  4. Step 4: Simplify right side
    99.45x = 12,955.86
  5. Step 5: Solve for x
    x = 12,955.86/99.45
  6. Step 6: Final answer
    x = 130.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.