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Finding the Fourth Proportional to 65, 97.40 and 45.70

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Solution

The fourth proportional to 65, 97.40 and 45.70 is: 68.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    65 : 97.40 = 45.70 : x
  2. Step 2: Convert to fraction form
    65/97.40 = 45.70/x
  3. Step 3: Cross multiply
    65x = 97.40 × 45.70
  4. Step 4: Simplify right side
    65x = 4,451.18
  5. Step 5: Solve for x
    x = 4,451.18/65
  6. Step 6: Final answer
    x = 68.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.