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Finding the Third Proportional to 385,640 and 830,478

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Solution

The third proportional to 385,640 and 830,478 is: 1,788,439.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,640 : 830,478 = 830,478 : x
  2. Step 2: Convert to fraction form
    385,640/830,478 = 830,478/x
  3. Step 3: Cross multiply
    385,640x = 830,478 × 830,478
  4. Step 4: Simplify right side
    385,640x = 689,693,708,484
  5. Step 5: Solve for x
    x = 689,693,708,484/385,640
  6. Step 6: Final answer
    x = 1,788,439.24

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.