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Finding the Fourth Proportional to 878,321.56, 1,211,638.62 and 555,487.96

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Solution

The fourth proportional to 878,321.56, 1,211,638.62 and 555,487.96 is: 766,291.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,321.56 : 1,211,638.62 = 555,487.96 : x
  2. Step 2: Convert to fraction form
    878,321.56/1,211,638.62 = 555,487.96/x
  3. Step 3: Cross multiply
    878,321.56x = 1,211,638.62 × 555,487.96
  4. Step 4: Simplify right side
    878,321.56x = 673,050,665,281.02
  5. Step 5: Solve for x
    x = 673,050,665,281.02/878,321.56
  6. Step 6: Final answer
    x = 766,291.86

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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.