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Finding the Fourth Proportional to 64.97, 89.60 and 40.39

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Solution

The fourth proportional to 64.97, 89.60 and 40.39 is: 55.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.97 : 89.60 = 40.39 : x
  2. Step 2: Convert to fraction form
    64.97/89.60 = 40.39/x
  3. Step 3: Cross multiply
    64.97x = 89.60 × 40.39
  4. Step 4: Simplify right side
    64.97x = 3,618.82
  5. Step 5: Solve for x
    x = 3,618.82/64.97
  6. Step 6: Final answer
    x = 55.70

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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.