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Finding the Third Proportional to 390,663 and 587,209.50

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Solution

The third proportional to 390,663 and 587,209.50 is: 882,640.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,663 : 587,209.50 = 587,209.50 : x
  2. Step 2: Convert to fraction form
    390,663/587,209.50 = 587,209.50/x
  3. Step 3: Cross multiply
    390,663x = 587,209.50 × 587,209.50
  4. Step 4: Simplify right side
    390,663x = 344,814,996,890.25
  5. Step 5: Solve for x
    x = 344,814,996,890.25/390,663
  6. Step 6: Final answer
    x = 882,640.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.