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Finding the Third Proportional to 684 and 784.50

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Solution

The third proportional to 684 and 784.50 is: 899.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    684 : 784.50 = 784.50 : x
  2. Step 2: Convert to fraction form
    684/784.50 = 784.50/x
  3. Step 3: Cross multiply
    684x = 784.50 × 784.50
  4. Step 4: Simplify right side
    684x = 615,440.25
  5. Step 5: Solve for x
    x = 615,440.25/684
  6. Step 6: Final answer
    x = 899.77

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.