Home / 1,191,385.60-1,787,078.40-687,500.80

Finding the Fourth Proportional to 1,191,385.60, 1,787,078.40 and 687,500.80

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Solution

The fourth proportional to 1,191,385.60, 1,787,078.40 and 687,500.80 is: 1,031,251.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191,385.60 : 1,787,078.40 = 687,500.80 : x
  2. Step 2: Convert to fraction form
    1,191,385.60/1,787,078.40 = 687,500.80/x
  3. Step 3: Cross multiply
    1,191,385.60x = 1,787,078.40 × 687,500.80
  4. Step 4: Simplify right side
    1,191,385.60x = 1,228,617,829,662.72
  5. Step 5: Solve for x
    x = 1,228,617,829,662.72/1,191,385.60
  6. Step 6: Final answer
    x = 1,031,251.20

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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.