Home / 821,520.16-1,231,178.71-639,370.90

Finding the Fourth Proportional to 821,520.16, 1,231,178.71 and 639,370.90

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Solution

The fourth proportional to 821,520.16, 1,231,178.71 and 639,370.90 is: 958,199.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,520.16 : 1,231,178.71 = 639,370.90 : x
  2. Step 2: Convert to fraction form
    821,520.16/1,231,178.71 = 639,370.90/x
  3. Step 3: Cross multiply
    821,520.16x = 1,231,178.71 × 639,370.90
  4. Step 4: Simplify right side
    821,520.16x = 787,179,830,520.79
  5. Step 5: Solve for x
    x = 787,179,830,520.79/821,520.16
  6. Step 6: Final answer
    x = 958,199.04

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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.