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Finding the Third Proportional to 393,020 and 842,120

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Solution

The third proportional to 393,020 and 842,120 is: 1,804,402.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,020 : 842,120 = 842,120 : x
  2. Step 2: Convert to fraction form
    393,020/842,120 = 842,120/x
  3. Step 3: Cross multiply
    393,020x = 842,120 × 842,120
  4. Step 4: Simplify right side
    393,020x = 709,166,094,400
  5. Step 5: Solve for x
    x = 709,166,094,400/393,020
  6. Step 6: Final answer
    x = 1,804,402.05

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.