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Finding the Fourth Proportional to 67.70, 100.98 and 64.46

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Solution

The fourth proportional to 67.70, 100.98 and 64.46 is: 96.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.70 : 100.98 = 64.46 : x
  2. Step 2: Convert to fraction form
    67.70/100.98 = 64.46/x
  3. Step 3: Cross multiply
    67.70x = 100.98 × 64.46
  4. Step 4: Simplify right side
    67.70x = 6,509.42
  5. Step 5: Solve for x
    x = 6,509.42/67.70
  6. Step 6: Final answer
    x = 96.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.