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Finding the Fourth Proportional to 993,210.80, 1,490,431.80 and 520,235.60

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Solution

The fourth proportional to 993,210.80, 1,490,431.80 and 520,235.60 is: 780,675.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    993,210.80 : 1,490,431.80 = 520,235.60 : x
  2. Step 2: Convert to fraction form
    993,210.80/1,490,431.80 = 520,235.60/x
  3. Step 3: Cross multiply
    993,210.80x = 1,490,431.80 × 520,235.60
  4. Step 4: Simplify right side
    993,210.80x = 775,375,681,732.08
  5. Step 5: Solve for x
    x = 775,375,681,732.08/993,210.80
  6. Step 6: Final answer
    x = 780,675.85

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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.