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Finding the Fourth Proportional to 780,107.85, 1,170,161.78 and 780,107.85

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Solution

The fourth proportional to 780,107.85, 1,170,161.78 and 780,107.85 is: 1,170,161.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,107.85 : 1,170,161.78 = 780,107.85 : x
  2. Step 2: Convert to fraction form
    780,107.85/1,170,161.78 = 780,107.85/x
  3. Step 3: Cross multiply
    780,107.85x = 1,170,161.78 × 780,107.85
  4. Step 4: Simplify right side
    780,107.85x = 912,852,386,447.43
  5. Step 5: Solve for x
    x = 912,852,386,447.43/780,107.85
  6. Step 6: Final answer
    x = 1,170,161.78

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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.