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Finding the Fourth Proportional to 1,985,712.97, 2,978,188.50 and 771,288.25

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Solution

The fourth proportional to 1,985,712.97, 2,978,188.50 and 771,288.25 is: 1,156,784.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985,712.97 : 2,978,188.50 = 771,288.25 : x
  2. Step 2: Convert to fraction form
    1,985,712.97/2,978,188.50 = 771,288.25/x
  3. Step 3: Cross multiply
    1,985,712.97x = 2,978,188.50 × 771,288.25
  4. Step 4: Simplify right side
    1,985,712.97x = 2,297,041,781,444.18
  5. Step 5: Solve for x
    x = 2,297,041,781,444.18/1,985,712.97
  6. Step 6: Final answer
    x = 1,156,784.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.