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Finding the Fourth Proportional to 73.19, 100.64 and 64.99

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Solution

The fourth proportional to 73.19, 100.64 and 64.99 is: 89.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.19 : 100.64 = 64.99 : x
  2. Step 2: Convert to fraction form
    73.19/100.64 = 64.99/x
  3. Step 3: Cross multiply
    73.19x = 100.64 × 64.99
  4. Step 4: Simplify right side
    73.19x = 6,540.88
  5. Step 5: Solve for x
    x = 6,540.88/73.19
  6. Step 6: Final answer
    x = 89.37

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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.