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Finding the Fourth Proportional to 68.92, 95.12 and 53.40

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Solution

The fourth proportional to 68.92, 95.12 and 53.40 is: 73.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.92 : 95.12 = 53.40 : x
  2. Step 2: Convert to fraction form
    68.92/95.12 = 53.40/x
  3. Step 3: Cross multiply
    68.92x = 95.12 × 53.40
  4. Step 4: Simplify right side
    68.92x = 5,079.41
  5. Step 5: Solve for x
    x = 5,079.41/68.92
  6. Step 6: Final answer
    x = 73.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.