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Finding the Third Proportional to 65 and 70.50

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Solution

The third proportional to 65 and 70.50 is: 76.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65 : 70.50 = 70.50 : x
  2. Step 2: Convert to fraction form
    65/70.50 = 70.50/x
  3. Step 3: Cross multiply
    65x = 70.50 × 70.50
  4. Step 4: Simplify right side
    65x = 4,970.25
  5. Step 5: Solve for x
    x = 4,970.25/65
  6. Step 6: Final answer
    x = 76.47

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.