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Finding the Fourth Proportional to 99.89, 137.84 and 58.45

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Solution

The fourth proportional to 99.89, 137.84 and 58.45 is: 80.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.89 : 137.84 = 58.45 : x
  2. Step 2: Convert to fraction form
    99.89/137.84 = 58.45/x
  3. Step 3: Cross multiply
    99.89x = 137.84 × 58.45
  4. Step 4: Simplify right side
    99.89x = 8,055.77
  5. Step 5: Solve for x
    x = 8,055.77/99.89
  6. Step 6: Final answer
    x = 80.65

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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.