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Finding the Fourth Proportional to 64.66, 88.70 and 63.98

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Solution

The fourth proportional to 64.66, 88.70 and 63.98 is: 87.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.66 : 88.70 = 63.98 : x
  2. Step 2: Convert to fraction form
    64.66/88.70 = 63.98/x
  3. Step 3: Cross multiply
    64.66x = 88.70 × 63.98
  4. Step 4: Simplify right side
    64.66x = 5,675.03
  5. Step 5: Solve for x
    x = 5,675.03/64.66
  6. Step 6: Final answer
    x = 87.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.