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Finding the Third Proportional to 642,838.50 and 1,382,421

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Solution

The third proportional to 642,838.50 and 1,382,421 is: 2,972,889.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,838.50 : 1,382,421 = 1,382,421 : x
  2. Step 2: Convert to fraction form
    642,838.50/1,382,421 = 1,382,421/x
  3. Step 3: Cross multiply
    642,838.50x = 1,382,421 × 1,382,421
  4. Step 4: Simplify right side
    642,838.50x = 1,911,087,821,241
  5. Step 5: Solve for x
    x = 1,911,087,821,241/642,838.50
  6. Step 6: Final answer
    x = 2,972,889.49

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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.