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Finding the Third Proportional to 309,972 and 478,770

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Solution

The third proportional to 309,972 and 478,770 is: 739,488.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,972 : 478,770 = 478,770 : x
  2. Step 2: Convert to fraction form
    309,972/478,770 = 478,770/x
  3. Step 3: Cross multiply
    309,972x = 478,770 × 478,770
  4. Step 4: Simplify right side
    309,972x = 229,220,712,900
  5. Step 5: Solve for x
    x = 229,220,712,900/309,972
  6. Step 6: Final answer
    x = 739,488.45

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.