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Finding the Third Proportional to 389,690 and 528,087

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Solution

The third proportional to 389,690 and 528,087 is: 715,635.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,690 : 528,087 = 528,087 : x
  2. Step 2: Convert to fraction form
    389,690/528,087 = 528,087/x
  3. Step 3: Cross multiply
    389,690x = 528,087 × 528,087
  4. Step 4: Simplify right side
    389,690x = 278,875,879,569
  5. Step 5: Solve for x
    x = 278,875,879,569/389,690
  6. Step 6: Final answer
    x = 715,635.20

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.