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Finding the Fourth Proportional to 46.96, 69.92 and 45

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Solution

The fourth proportional to 46.96, 69.92 and 45 is: 67.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.96 : 69.92 = 45 : x
  2. Step 2: Convert to fraction form
    46.96/69.92 = 45/x
  3. Step 3: Cross multiply
    46.96x = 69.92 × 45
  4. Step 4: Simplify right side
    46.96x = 3,146.40
  5. Step 5: Solve for x
    x = 3,146.40/46.96
  6. Step 6: Final answer
    x = 67.00

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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.