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Finding the Third Proportional to 243,280 and 387,405

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Solution

The third proportional to 243,280 and 387,405 is: 616,913.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,280 : 387,405 = 387,405 : x
  2. Step 2: Convert to fraction form
    243,280/387,405 = 387,405/x
  3. Step 3: Cross multiply
    243,280x = 387,405 × 387,405
  4. Step 4: Simplify right side
    243,280x = 150,082,634,025
  5. Step 5: Solve for x
    x = 150,082,634,025/243,280
  6. Step 6: Final answer
    x = 616,913.16

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.