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Finding the Fourth Proportional to 68.70, 103.45 and 59.79

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Solution

The fourth proportional to 68.70, 103.45 and 59.79 is: 90.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.70 : 103.45 = 59.79 : x
  2. Step 2: Convert to fraction form
    68.70/103.45 = 59.79/x
  3. Step 3: Cross multiply
    68.70x = 103.45 × 59.79
  4. Step 4: Simplify right side
    68.70x = 6,184.76
  5. Step 5: Solve for x
    x = 6,184.76/68.70
  6. Step 6: Final answer
    x = 90.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.