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Finding the Fourth Proportional to 660,821.88, 911,916.45 and 388,905.78

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Solution

The fourth proportional to 660,821.88, 911,916.45 and 388,905.78 is: 536,679.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,821.88 : 911,916.45 = 388,905.78 : x
  2. Step 2: Convert to fraction form
    660,821.88/911,916.45 = 388,905.78/x
  3. Step 3: Cross multiply
    660,821.88x = 911,916.45 × 388,905.78
  4. Step 4: Simplify right side
    660,821.88x = 354,649,578,282.08
  5. Step 5: Solve for x
    x = 354,649,578,282.08/660,821.88
  6. Step 6: Final answer
    x = 536,679.53

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1.5x scale

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.