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Finding the Third Proportional to 356,621 and 553,980

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Solution

The third proportional to 356,621 and 553,980 is: 860,560.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    356,621 : 553,980 = 553,980 : x
  2. Step 2: Convert to fraction form
    356,621/553,980 = 553,980/x
  3. Step 3: Cross multiply
    356,621x = 553,980 × 553,980
  4. Step 4: Simplify right side
    356,621x = 306,893,840,400
  5. Step 5: Solve for x
    x = 306,893,840,400/356,621
  6. Step 6: Final answer
    x = 860,560.20

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.