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Finding the Third Proportional to 277,420 and 430,386

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Solution

The third proportional to 277,420 and 430,386 is: 667,695.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    277,420 : 430,386 = 430,386 : x
  2. Step 2: Convert to fraction form
    277,420/430,386 = 430,386/x
  3. Step 3: Cross multiply
    277,420x = 430,386 × 430,386
  4. Step 4: Simplify right side
    277,420x = 185,232,108,996
  5. Step 5: Solve for x
    x = 185,232,108,996/277,420
  6. Step 6: Final answer
    x = 667,695.58

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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.