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Finding the Fourth Proportional to 97.45, 134.40 and 64.76

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Solution

The fourth proportional to 97.45, 134.40 and 64.76 is: 89.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.45 : 134.40 = 64.76 : x
  2. Step 2: Convert to fraction form
    97.45/134.40 = 64.76/x
  3. Step 3: Cross multiply
    97.45x = 134.40 × 64.76
  4. Step 4: Simplify right side
    97.45x = 8,703.74
  5. Step 5: Solve for x
    x = 8,703.74/97.45
  6. Step 6: Final answer
    x = 89.32

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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.