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Finding the Fourth Proportional to 67.45, 100.64 and 58.45

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Solution

The fourth proportional to 67.45, 100.64 and 58.45 is: 87.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.45 : 100.64 = 58.45 : x
  2. Step 2: Convert to fraction form
    67.45/100.64 = 58.45/x
  3. Step 3: Cross multiply
    67.45x = 100.64 × 58.45
  4. Step 4: Simplify right side
    67.45x = 5,882.41
  5. Step 5: Solve for x
    x = 5,882.41/67.45
  6. Step 6: Final answer
    x = 87.21

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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.