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Finding the Fourth Proportional to 64.70, 97.10 and 28.66

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Solution

The fourth proportional to 64.70, 97.10 and 28.66 is: 43.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.70 : 97.10 = 28.66 : x
  2. Step 2: Convert to fraction form
    64.70/97.10 = 28.66/x
  3. Step 3: Cross multiply
    64.70x = 97.10 × 28.66
  4. Step 4: Simplify right side
    64.70x = 2,782.89
  5. Step 5: Solve for x
    x = 2,782.89/64.70
  6. Step 6: Final answer
    x = 43.01

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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.