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Finding the Fourth Proportional to 67.46, 100.47 and 67.07

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Solution

The fourth proportional to 67.46, 100.47 and 67.07 is: 99.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.46 : 100.47 = 67.07 : x
  2. Step 2: Convert to fraction form
    67.46/100.47 = 67.07/x
  3. Step 3: Cross multiply
    67.46x = 100.47 × 67.07
  4. Step 4: Simplify right side
    67.46x = 6,738.77
  5. Step 5: Solve for x
    x = 6,738.77/67.46
  6. Step 6: Final answer
    x = 99.89

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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.