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Finding the Fourth Proportional to 97.36, 145.72 and 68.40

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Solution

The fourth proportional to 97.36, 145.72 and 68.40 is: 102.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.36 : 145.72 = 68.40 : x
  2. Step 2: Convert to fraction form
    97.36/145.72 = 68.40/x
  3. Step 3: Cross multiply
    97.36x = 145.72 × 68.40
  4. Step 4: Simplify right side
    97.36x = 9,967.25
  5. Step 5: Solve for x
    x = 9,967.25/97.36
  6. Step 6: Final answer
    x = 102.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.