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Finding the Third Proportional to 257,439 and 553,620

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Solution

The third proportional to 257,439 and 553,620 is: 1,190,554.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,439 : 553,620 = 553,620 : x
  2. Step 2: Convert to fraction form
    257,439/553,620 = 553,620/x
  3. Step 3: Cross multiply
    257,439x = 553,620 × 553,620
  4. Step 4: Simplify right side
    257,439x = 306,495,104,400
  5. Step 5: Solve for x
    x = 306,495,104,400/257,439
  6. Step 6: Final answer
    x = 1,190,554.28

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.