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Finding the Fourth Proportional to 1,861,103.90, 2,791,983.90 and 663,721.40

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Solution

The fourth proportional to 1,861,103.90, 2,791,983.90 and 663,721.40 is: 995,699.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861,103.90 : 2,791,983.90 = 663,721.40 : x
  2. Step 2: Convert to fraction form
    1,861,103.90/2,791,983.90 = 663,721.40/x
  3. Step 3: Cross multiply
    1,861,103.90x = 2,791,983.90 × 663,721.40
  4. Step 4: Simplify right side
    1,861,103.90x = 1,853,099,462,885.46
  5. Step 5: Solve for x
    x = 1,853,099,462,885.46/1,861,103.90
  6. Step 6: Final answer
    x = 995,699.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.