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Finding the Fourth Proportional to 73.81, 101.45 and 64.70

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Solution

The fourth proportional to 73.81, 101.45 and 64.70 is: 88.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.81 : 101.45 = 64.70 : x
  2. Step 2: Convert to fraction form
    73.81/101.45 = 64.70/x
  3. Step 3: Cross multiply
    73.81x = 101.45 × 64.70
  4. Step 4: Simplify right side
    73.81x = 6,563.85
  5. Step 5: Solve for x
    x = 6,563.85/73.81
  6. Step 6: Final answer
    x = 88.93

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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.