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Finding the Fourth Proportional to 1,222,874, 1,687,566.12 and 686,330

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Solution

The fourth proportional to 1,222,874, 1,687,566.12 and 686,330 is: 947,135.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222,874 : 1,687,566.12 = 686,330 : x
  2. Step 2: Convert to fraction form
    1,222,874/1,687,566.12 = 686,330/x
  3. Step 3: Cross multiply
    1,222,874x = 1,687,566.12 × 686,330
  4. Step 4: Simplify right side
    1,222,874x = 1,158,227,255,139.60
  5. Step 5: Solve for x
    x = 1,158,227,255,139.60/1,222,874
  6. Step 6: Final answer
    x = 947,135.40

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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.