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Finding the Fourth Proportional to 1,222,865, 1,687,553.70 and 686,321

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Solution

The fourth proportional to 1,222,865, 1,687,553.70 and 686,321 is: 947,122.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222,865 : 1,687,553.70 = 686,321 : x
  2. Step 2: Convert to fraction form
    1,222,865/1,687,553.70 = 686,321/x
  3. Step 3: Cross multiply
    1,222,865x = 1,687,553.70 × 686,321
  4. Step 4: Simplify right side
    1,222,865x = 1,158,203,542,937.70
  5. Step 5: Solve for x
    x = 1,158,203,542,937.70/1,222,865
  6. Step 6: Final answer
    x = 947,122.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.