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Finding the Fourth Proportional to 714,231.81, 985,651.98 and 391,971.90

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Solution

The fourth proportional to 714,231.81, 985,651.98 and 391,971.90 is: 540,927.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,231.81 : 985,651.98 = 391,971.90 : x
  2. Step 2: Convert to fraction form
    714,231.81/985,651.98 = 391,971.90/x
  3. Step 3: Cross multiply
    714,231.81x = 985,651.98 × 391,971.90
  4. Step 4: Simplify right side
    714,231.81x = 386,347,879,339.36
  5. Step 5: Solve for x
    x = 386,347,879,339.36/714,231.81
  6. Step 6: Final answer
    x = 540,927.85

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Double scale
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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.