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Finding the Third Proportional to 280,712 and 431,479

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Solution

The third proportional to 280,712 and 431,479 is: 663,221.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,712 : 431,479 = 431,479 : x
  2. Step 2: Convert to fraction form
    280,712/431,479 = 431,479/x
  3. Step 3: Cross multiply
    280,712x = 431,479 × 431,479
  4. Step 4: Simplify right side
    280,712x = 186,174,127,441
  5. Step 5: Solve for x
    x = 186,174,127,441/280,712
  6. Step 6: Final answer
    x = 663,221.12

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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.