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Finding the Fourth Proportional to 100.07, 138.23 and 68.93

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Solution

The fourth proportional to 100.07, 138.23 and 68.93 is: 95.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.07 : 138.23 = 68.93 : x
  2. Step 2: Convert to fraction form
    100.07/138.23 = 68.93/x
  3. Step 3: Cross multiply
    100.07x = 138.23 × 68.93
  4. Step 4: Simplify right side
    100.07x = 9,528.58
  5. Step 5: Solve for x
    x = 9,528.58/100.07
  6. Step 6: Final answer
    x = 95.22

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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.