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Finding the Fourth Proportional to 879,318.80, 1,318,978.20 and 520,067.60

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Solution

The fourth proportional to 879,318.80, 1,318,978.20 and 520,067.60 is: 780,101.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,318.80 : 1,318,978.20 = 520,067.60 : x
  2. Step 2: Convert to fraction form
    879,318.80/1,318,978.20 = 520,067.60/x
  3. Step 3: Cross multiply
    879,318.80x = 1,318,978.20 × 520,067.60
  4. Step 4: Simplify right side
    879,318.80x = 685,957,826,926.32
  5. Step 5: Solve for x
    x = 685,957,826,926.32/879,318.80
  6. Step 6: Final answer
    x = 780,101.40

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1.5x scale

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.