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Finding the Fourth Proportional to 99.56, 148.94 and 67.40

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Solution

The fourth proportional to 99.56, 148.94 and 67.40 is: 100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.56 : 148.94 = 67.40 : x
  2. Step 2: Convert to fraction form
    99.56/148.94 = 67.40/x
  3. Step 3: Cross multiply
    99.56x = 148.94 × 67.40
  4. Step 4: Simplify right side
    99.56x = 10,038.56
  5. Step 5: Solve for x
    x = 10,038.56/99.56
  6. Step 6: Final answer
    x = 100.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.