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Finding the Third Proportional to 299,386 and 645,428

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Solution

The third proportional to 299,386 and 645,428 is: 1,391,438.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,386 : 645,428 = 645,428 : x
  2. Step 2: Convert to fraction form
    299,386/645,428 = 645,428/x
  3. Step 3: Cross multiply
    299,386x = 645,428 × 645,428
  4. Step 4: Simplify right side
    299,386x = 416,577,303,184
  5. Step 5: Solve for x
    x = 416,577,303,184/299,386
  6. Step 6: Final answer
    x = 1,391,438.82

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.