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Finding the Fourth Proportional to 711,490.86, 981,880.81 and 389,193.59

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Solution

The fourth proportional to 711,490.86, 981,880.81 and 389,193.59 is: 537,099.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,490.86 : 981,880.81 = 389,193.59 : x
  2. Step 2: Convert to fraction form
    711,490.86/981,880.81 = 389,193.59/x
  3. Step 3: Cross multiply
    711,490.86x = 981,880.81 × 389,193.59
  4. Step 4: Simplify right side
    711,490.86x = 382,141,712,486.60
  5. Step 5: Solve for x
    x = 382,141,712,486.60/711,490.86
  6. Step 6: Final answer
    x = 537,099.96

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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.