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Finding the Third Proportional to 531.50 and 642.50

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Solution

The third proportional to 531.50 and 642.50 is: 776.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.50 : 642.50 = 642.50 : x
  2. Step 2: Convert to fraction form
    531.50/642.50 = 642.50/x
  3. Step 3: Cross multiply
    531.50x = 642.50 × 642.50
  4. Step 4: Simplify right side
    531.50x = 412,806.25
  5. Step 5: Solve for x
    x = 412,806.25/531.50
  6. Step 6: Final answer
    x = 776.68

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.