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Finding the Fourth Proportional to 67.69, 93.45 and 64.79

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Solution

The fourth proportional to 67.69, 93.45 and 64.79 is: 89.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.69 : 93.45 = 64.79 : x
  2. Step 2: Convert to fraction form
    67.69/93.45 = 64.79/x
  3. Step 3: Cross multiply
    67.69x = 93.45 × 64.79
  4. Step 4: Simplify right side
    67.69x = 6,054.63
  5. Step 5: Solve for x
    x = 6,054.63/67.69
  6. Step 6: Final answer
    x = 89.45

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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.