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Finding the Third Proportional to 390.88 and 502.50

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Solution

The third proportional to 390.88 and 502.50 is: 646.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.88 : 502.50 = 502.50 : x
  2. Step 2: Convert to fraction form
    390.88/502.50 = 502.50/x
  3. Step 3: Cross multiply
    390.88x = 502.50 × 502.50
  4. Step 4: Simplify right side
    390.88x = 252,506.25
  5. Step 5: Solve for x
    x = 252,506.25/390.88
  6. Step 6: Final answer
    x = 646.00

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.