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Finding the Third Proportional to 291,254 and 391,459

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Solution

The third proportional to 291,254 and 391,459 is: 526,139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,254 : 391,459 = 391,459 : x
  2. Step 2: Convert to fraction form
    291,254/391,459 = 391,459/x
  3. Step 3: Cross multiply
    291,254x = 391,459 × 391,459
  4. Step 4: Simplify right side
    291,254x = 153,240,148,681
  5. Step 5: Solve for x
    x = 153,240,148,681/291,254
  6. Step 6: Final answer
    x = 526,139.21

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.