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Finding the Third Proportional to 311,904 and 455,220

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Solution

The third proportional to 311,904 and 455,220 is: 664,387.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,904 : 455,220 = 455,220 : x
  2. Step 2: Convert to fraction form
    311,904/455,220 = 455,220/x
  3. Step 3: Cross multiply
    311,904x = 455,220 × 455,220
  4. Step 4: Simplify right side
    311,904x = 207,225,248,400
  5. Step 5: Solve for x
    x = 207,225,248,400/311,904
  6. Step 6: Final answer
    x = 664,387.92

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.