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Finding the Third Proportional to 215,570 and 289,998

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Solution

The third proportional to 215,570 and 289,998 is: 390,123.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,570 : 289,998 = 289,998 : x
  2. Step 2: Convert to fraction form
    215,570/289,998 = 289,998/x
  3. Step 3: Cross multiply
    215,570x = 289,998 × 289,998
  4. Step 4: Simplify right side
    215,570x = 84,098,840,004
  5. Step 5: Solve for x
    x = 84,098,840,004/215,570
  6. Step 6: Final answer
    x = 390,123.12

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.