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Finding the Fourth Proportional to 711,396.90, 981,751.05 and 389,106.98

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Solution

The fourth proportional to 711,396.90, 981,751.05 and 389,106.98 is: 536,980.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,396.90 : 981,751.05 = 389,106.98 : x
  2. Step 2: Convert to fraction form
    711,396.90/981,751.05 = 389,106.98/x
  3. Step 3: Cross multiply
    711,396.90x = 981,751.05 × 389,106.98
  4. Step 4: Simplify right side
    711,396.90x = 382,006,186,177.33
  5. Step 5: Solve for x
    x = 382,006,186,177.33/711,396.90
  6. Step 6: Final answer
    x = 536,980.39

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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.