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Finding the Fourth Proportional to 911,686.40, 1,369,862.40 and 809,043.20

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Solution

The fourth proportional to 911,686.40, 1,369,862.40 and 809,043.20 is: 1,215,634.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,686.40 : 1,369,862.40 = 809,043.20 : x
  2. Step 2: Convert to fraction form
    911,686.40/1,369,862.40 = 809,043.20/x
  3. Step 3: Cross multiply
    911,686.40x = 1,369,862.40 × 809,043.20
  4. Step 4: Simplify right side
    911,686.40x = 1,108,277,859,655.68
  5. Step 5: Solve for x
    x = 1,108,277,859,655.68/911,686.40
  6. Step 6: Final answer
    x = 1,215,634.96

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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.