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Finding the Fourth Proportional to 876,840.80, 1,315,261.20 and 699,693.80

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Solution

The fourth proportional to 876,840.80, 1,315,261.20 and 699,693.80 is: 1,049,540.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,840.80 : 1,315,261.20 = 699,693.80 : x
  2. Step 2: Convert to fraction form
    876,840.80/1,315,261.20 = 699,693.80/x
  3. Step 3: Cross multiply
    876,840.80x = 1,315,261.20 × 699,693.80
  4. Step 4: Simplify right side
    876,840.80x = 920,280,107,020.56
  5. Step 5: Solve for x
    x = 920,280,107,020.56/876,840.80
  6. Step 6: Final answer
    x = 1,049,540.70

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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.