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Finding the Fourth Proportional to 67.65, 93.16 and 53.79

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Solution

The fourth proportional to 67.65, 93.16 and 53.79 is: 74.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.65 : 93.16 = 53.79 : x
  2. Step 2: Convert to fraction form
    67.65/93.16 = 53.79/x
  3. Step 3: Cross multiply
    67.65x = 93.16 × 53.79
  4. Step 4: Simplify right side
    67.65x = 5,011.08
  5. Step 5: Solve for x
    x = 5,011.08/67.65
  6. Step 6: Final answer
    x = 74.07

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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.