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Finding the Fourth Proportional to 712,199.78, 982,806.08 and 389,901.86

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Solution

The fourth proportional to 712,199.78, 982,806.08 and 389,901.86 is: 538,048.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,199.78 : 982,806.08 = 389,901.86 : x
  2. Step 2: Convert to fraction form
    712,199.78/982,806.08 = 389,901.86/x
  3. Step 3: Cross multiply
    712,199.78x = 982,806.08 × 389,901.86
  4. Step 4: Simplify right side
    712,199.78x = 383,197,918,611.31
  5. Step 5: Solve for x
    x = 383,197,918,611.31/712,199.78
  6. Step 6: Final answer
    x = 538,048.35

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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.