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Finding the Fourth Proportional to 64.87, 97.36 and 42.05

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Solution

The fourth proportional to 64.87, 97.36 and 42.05 is: 63.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.87 : 97.36 = 42.05 : x
  2. Step 2: Convert to fraction form
    64.87/97.36 = 42.05/x
  3. Step 3: Cross multiply
    64.87x = 97.36 × 42.05
  4. Step 4: Simplify right side
    64.87x = 4,094.13
  5. Step 5: Solve for x
    x = 4,094.13/64.87
  6. Step 6: Final answer
    x = 63.12

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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.