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Finding the Fourth Proportional to 911,908.59, 1,257,781.20 and 640,037.15

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Solution

The fourth proportional to 911,908.59, 1,257,781.20 and 640,037.15 is: 882,793.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,908.59 : 1,257,781.20 = 640,037.15 : x
  2. Step 2: Convert to fraction form
    911,908.59/1,257,781.20 = 640,037.15/x
  3. Step 3: Cross multiply
    911,908.59x = 1,257,781.20 × 640,037.15
  4. Step 4: Simplify right side
    911,908.59x = 805,026,688,282.67
  5. Step 5: Solve for x
    x = 805,026,688,282.67/911,908.59
  6. Step 6: Final answer
    x = 882,793.18

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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.