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Finding the Fourth Proportional to 67.91, 93.76 and 65.48

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Solution

The fourth proportional to 67.91, 93.76 and 65.48 is: 90.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.91 : 93.76 = 65.48 : x
  2. Step 2: Convert to fraction form
    67.91/93.76 = 65.48/x
  3. Step 3: Cross multiply
    67.91x = 93.76 × 65.48
  4. Step 4: Simplify right side
    67.91x = 6,138.77
  5. Step 5: Solve for x
    x = 6,138.77/67.91
  6. Step 6: Final answer
    x = 90.40

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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.