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Finding the Fourth Proportional to 666,640.28, 919,803.01 and 404,987.98

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Solution

The fourth proportional to 666,640.28, 919,803.01 and 404,987.98 is: 558,785.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,640.28 : 919,803.01 = 404,987.98 : x
  2. Step 2: Convert to fraction form
    666,640.28/919,803.01 = 404,987.98/x
  3. Step 3: Cross multiply
    666,640.28x = 919,803.01 × 404,987.98
  4. Step 4: Simplify right side
    666,640.28x = 372,509,164,030.29
  5. Step 5: Solve for x
    x = 372,509,164,030.29/666,640.28
  6. Step 6: Final answer
    x = 558,785.86

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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.