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Finding the Fourth Proportional to 1,318,994.40, 1,978,102.80 and 520,010.40

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Solution

The fourth proportional to 1,318,994.40, 1,978,102.80 and 520,010.40 is: 779,862.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,994.40 : 1,978,102.80 = 520,010.40 : x
  2. Step 2: Convert to fraction form
    1,318,994.40/1,978,102.80 = 520,010.40/x
  3. Step 3: Cross multiply
    1,318,994.40x = 1,978,102.80 × 520,010.40
  4. Step 4: Simplify right side
    1,318,994.40x = 1,028,634,028,269.12
  5. Step 5: Solve for x
    x = 1,028,634,028,269.12/1,318,994.40
  6. Step 6: Final answer
    x = 779,862.32

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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.