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Finding the Fourth Proportional to 1,318,813.60, 1,978,220.40 and 520,121.20

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Solution

The fourth proportional to 1,318,813.60, 1,978,220.40 and 520,121.20 is: 780,181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,813.60 : 1,978,220.40 = 520,121.20 : x
  2. Step 2: Convert to fraction form
    1,318,813.60/1,978,220.40 = 520,121.20/x
  3. Step 3: Cross multiply
    1,318,813.60x = 1,978,220.40 × 520,121.20
  4. Step 4: Simplify right side
    1,318,813.60x = 1,028,914,368,312.48
  5. Step 5: Solve for x
    x = 1,028,914,368,312.48/1,318,813.60
  6. Step 6: Final answer
    x = 780,181.80

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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.