Home / 811,999.70-1,217,999.55-391,318.10

Finding the Fourth Proportional to 811,999.70, 1,217,999.55 and 391,318.10

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Solution

The fourth proportional to 811,999.70, 1,217,999.55 and 391,318.10 is: 586,977.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,999.70 : 1,217,999.55 = 391,318.10 : x
  2. Step 2: Convert to fraction form
    811,999.70/1,217,999.55 = 391,318.10/x
  3. Step 3: Cross multiply
    811,999.70x = 1,217,999.55 × 391,318.10
  4. Step 4: Simplify right side
    811,999.70x = 476,625,269,706.86
  5. Step 5: Solve for x
    x = 476,625,269,706.86/811,999.70
  6. Step 6: Final answer
    x = 586,977.15

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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.