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Finding the Fourth Proportional to 872,562.40, 1,308,843.60 and 860,120.80

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Solution

The fourth proportional to 872,562.40, 1,308,843.60 and 860,120.80 is: 1,290,181.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    872,562.40 : 1,308,843.60 = 860,120.80 : x
  2. Step 2: Convert to fraction form
    872,562.40/1,308,843.60 = 860,120.80/x
  3. Step 3: Cross multiply
    872,562.40x = 1,308,843.60 × 860,120.80
  4. Step 4: Simplify right side
    872,562.40x = 1,125,763,604,306.88
  5. Step 5: Solve for x
    x = 1,125,763,604,306.88/872,562.40
  6. Step 6: Final answer
    x = 1,290,181.20

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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.