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Finding the Third Proportional to 317,405,144 and 687,777,970

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Solution

The third proportional to 317,405,144 and 687,777,970 is: 1,490,330,402.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,405,144 : 687,777,970 = 687,777,970 : x
  2. Step 2: Convert to fraction form
    317,405,144/687,777,970 = 687,777,970/x
  3. Step 3: Cross multiply
    317,405,144x = 687,777,970 × 687,777,970
  4. Step 4: Simplify right side
    317,405,144x = 473,038,536,017,320,896
  5. Step 5: Solve for x
    x = 473,038,536,017,320,896/317,405,144
  6. Step 6: Final answer
    x = 1,490,330,402.51

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.