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Finding the Fourth Proportional to 65.70, 91.15 and 60.30

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Solution

The fourth proportional to 65.70, 91.15 and 60.30 is: 83.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.70 : 91.15 = 60.30 : x
  2. Step 2: Convert to fraction form
    65.70/91.15 = 60.30/x
  3. Step 3: Cross multiply
    65.70x = 91.15 × 60.30
  4. Step 4: Simplify right side
    65.70x = 5,496.19
  5. Step 5: Solve for x
    x = 5,496.19/65.70
  6. Step 6: Final answer
    x = 83.66

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.