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Finding the Third Proportional to 261,280 and 390,903

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Solution

The third proportional to 261,280 and 390,903 is: 584,832.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,280 : 390,903 = 390,903 : x
  2. Step 2: Convert to fraction form
    261,280/390,903 = 390,903/x
  3. Step 3: Cross multiply
    261,280x = 390,903 × 390,903
  4. Step 4: Simplify right side
    261,280x = 152,805,155,409
  5. Step 5: Solve for x
    x = 152,805,155,409/261,280
  6. Step 6: Final answer
    x = 584,832.96

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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.