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Finding the Fourth Proportional to 1,218,188.61, 1,827,905.40 and 813,656.52

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Solution

The fourth proportional to 1,218,188.61, 1,827,905.40 and 813,656.52 is: 1,220,900.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218,188.61 : 1,827,905.40 = 813,656.52 : x
  2. Step 2: Convert to fraction form
    1,218,188.61/1,827,905.40 = 813,656.52/x
  3. Step 3: Cross multiply
    1,218,188.61x = 1,827,905.40 × 813,656.52
  4. Step 4: Simplify right side
    1,218,188.61x = 1,487,287,146,653.21
  5. Step 5: Solve for x
    x = 1,487,287,146,653.21/1,218,188.61
  6. Step 6: Final answer
    x = 1,220,900.55

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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.