Home / 714,107.70-985,435.65-391,809.78

Finding the Fourth Proportional to 714,107.70, 985,435.65 and 391,809.78

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Solution

The fourth proportional to 714,107.70, 985,435.65 and 391,809.78 is: 540,679.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,107.70 : 985,435.65 = 391,809.78 : x
  2. Step 2: Convert to fraction form
    714,107.70/985,435.65 = 391,809.78/x
  3. Step 3: Cross multiply
    714,107.70x = 985,435.65 × 391,809.78
  4. Step 4: Simplify right side
    714,107.70x = 386,103,325,230.66
  5. Step 5: Solve for x
    x = 386,103,325,230.66/714,107.70
  6. Step 6: Final answer
    x = 540,679.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.