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Finding the Fourth Proportional to 100.03, 138.09 and 58.58

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Solution

The fourth proportional to 100.03, 138.09 and 58.58 is: 80.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.03 : 138.09 = 58.58 : x
  2. Step 2: Convert to fraction form
    100.03/138.09 = 58.58/x
  3. Step 3: Cross multiply
    100.03x = 138.09 × 58.58
  4. Step 4: Simplify right side
    100.03x = 8,088.82
  5. Step 5: Solve for x
    x = 8,088.82/100.03
  6. Step 6: Final answer
    x = 80.86

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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.