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Finding the Third Proportional to 261,229 and 390,831

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Solution

The third proportional to 261,229 and 390,831 is: 584,731.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,229 : 390,831 = 390,831 : x
  2. Step 2: Convert to fraction form
    261,229/390,831 = 390,831/x
  3. Step 3: Cross multiply
    261,229x = 390,831 × 390,831
  4. Step 4: Simplify right side
    261,229x = 152,748,870,561
  5. Step 5: Solve for x
    x = 152,748,870,561/261,229
  6. Step 6: Final answer
    x = 584,731.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.