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Finding the Fourth Proportional to 813,840.80, 1,220,415.60 and 393,245.60

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Solution

The fourth proportional to 813,840.80, 1,220,415.60 and 393,245.60 is: 589,701.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,840.80 : 1,220,415.60 = 393,245.60 : x
  2. Step 2: Convert to fraction form
    813,840.80/1,220,415.60 = 393,245.60/x
  3. Step 3: Cross multiply
    813,840.80x = 1,220,415.60 × 393,245.60
  4. Step 4: Simplify right side
    813,840.80x = 479,923,064,871.36
  5. Step 5: Solve for x
    x = 479,923,064,871.36/813,840.80
  6. Step 6: Final answer
    x = 589,701.41

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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.