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Finding the Third Proportional to 428.75 and 557.50

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Solution

The third proportional to 428.75 and 557.50 is: 724.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.75 : 557.50 = 557.50 : x
  2. Step 2: Convert to fraction form
    428.75/557.50 = 557.50/x
  3. Step 3: Cross multiply
    428.75x = 557.50 × 557.50
  4. Step 4: Simplify right side
    428.75x = 310,806.25
  5. Step 5: Solve for x
    x = 310,806.25/428.75
  6. Step 6: Final answer
    x = 724.91

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.