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Finding the Fourth Proportional to 711,506.88, 981,904.80 and 389,197.76

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Solution

The fourth proportional to 711,506.88, 981,904.80 and 389,197.76 is: 537,106.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,506.88 : 981,904.80 = 389,197.76 : x
  2. Step 2: Convert to fraction form
    711,506.88/981,904.80 = 389,197.76/x
  3. Step 3: Cross multiply
    711,506.88x = 981,904.80 × 389,197.76
  4. Step 4: Simplify right side
    711,506.88x = 382,155,148,693.25
  5. Step 5: Solve for x
    x = 382,155,148,693.25/711,506.88
  6. Step 6: Final answer
    x = 537,106.75

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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.