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Finding the Fourth Proportional to 97.12, 145.60 and 45.76

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Solution

The fourth proportional to 97.12, 145.60 and 45.76 is: 68.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.12 : 145.60 = 45.76 : x
  2. Step 2: Convert to fraction form
    97.12/145.60 = 45.76/x
  3. Step 3: Cross multiply
    97.12x = 145.60 × 45.76
  4. Step 4: Simplify right side
    97.12x = 6,662.66
  5. Step 5: Solve for x
    x = 6,662.66/97.12
  6. Step 6: Final answer
    x = 68.60

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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.