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Finding the Third Proportional to 915,788 and 1,989,220

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Solution

The third proportional to 915,788 and 1,989,220 is: 4,320,864.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    915,788 : 1,989,220 = 1,989,220 : x
  2. Step 2: Convert to fraction form
    915,788/1,989,220 = 1,989,220/x
  3. Step 3: Cross multiply
    915,788x = 1,989,220 × 1,989,220
  4. Step 4: Simplify right side
    915,788x = 3,956,996,208,400
  5. Step 5: Solve for x
    x = 3,956,996,208,400/915,788
  6. Step 6: Final answer
    x = 4,320,864.88

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.