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Finding the Fourth Proportional to 716,806.61, 989,185.61 and 394,509.78

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Solution

The fourth proportional to 716,806.61, 989,185.61 and 394,509.78 is: 544,419.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,806.61 : 989,185.61 = 394,509.78 : x
  2. Step 2: Convert to fraction form
    716,806.61/989,185.61 = 394,509.78/x
  3. Step 3: Cross multiply
    716,806.61x = 989,185.61 × 394,509.78
  4. Step 4: Simplify right side
    716,806.61x = 390,243,395,407.72
  5. Step 5: Solve for x
    x = 390,243,395,407.72/716,806.61
  6. Step 6: Final answer
    x = 544,419.36

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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.