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Finding the Fourth Proportional to 99.63, 137.48 and 58.18

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Solution

The fourth proportional to 99.63, 137.48 and 58.18 is: 80.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.63 : 137.48 = 58.18 : x
  2. Step 2: Convert to fraction form
    99.63/137.48 = 58.18/x
  3. Step 3: Cross multiply
    99.63x = 137.48 × 58.18
  4. Step 4: Simplify right side
    99.63x = 7,998.30
  5. Step 5: Solve for x
    x = 7,998.30/99.63
  6. Step 6: Final answer
    x = 80.28

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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.