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Finding the Fourth Proportional to 1,387,689.28, 1,914,905.52 and 843,749.56

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Solution

The fourth proportional to 1,387,689.28, 1,914,905.52 and 843,749.56 is: 1,164,310.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,689.28 : 1,914,905.52 = 843,749.56 : x
  2. Step 2: Convert to fraction form
    1,387,689.28/1,914,905.52 = 843,749.56/x
  3. Step 3: Cross multiply
    1,387,689.28x = 1,914,905.52 × 843,749.56
  4. Step 4: Simplify right side
    1,387,689.28x = 1,615,700,689,941.57
  5. Step 5: Solve for x
    x = 1,615,700,689,941.57/1,387,689.28
  6. Step 6: Final answer
    x = 1,164,310.13

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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.