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Finding the Fourth Proportional to 618,886.81, 854,343.59 and 389,780.77

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Solution

The fourth proportional to 618,886.81, 854,343.59 and 389,780.77 is: 538,073.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,886.81 : 854,343.59 = 389,780.77 : x
  2. Step 2: Convert to fraction form
    618,886.81/854,343.59 = 389,780.77/x
  3. Step 3: Cross multiply
    618,886.81x = 854,343.59 × 389,780.77
  4. Step 4: Simplify right side
    618,886.81x = 333,006,700,405.86
  5. Step 5: Solve for x
    x = 333,006,700,405.86/618,886.81
  6. Step 6: Final answer
    x = 538,073.68

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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.