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Finding the Fourth Proportional to 911,690.40, 1,369,868.40 and 809,047.20

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Solution

The fourth proportional to 911,690.40, 1,369,868.40 and 809,047.20 is: 1,215,640.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,690.40 : 1,369,868.40 = 809,047.20 : x
  2. Step 2: Convert to fraction form
    911,690.40/1,369,868.40 = 809,047.20/x
  3. Step 3: Cross multiply
    911,690.40x = 1,369,868.40 × 809,047.20
  4. Step 4: Simplify right side
    911,690.40x = 1,108,288,193,388.48
  5. Step 5: Solve for x
    x = 1,108,288,193,388.48/911,690.40
  6. Step 6: Final answer
    x = 1,215,640.96

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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.