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Finding the Fourth Proportional to 712,882.76, 983,778.01 and 390,605.09

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Solution

The fourth proportional to 712,882.76, 983,778.01 and 390,605.09 is: 539,034.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,882.76 : 983,778.01 = 390,605.09 : x
  2. Step 2: Convert to fraction form
    712,882.76/983,778.01 = 390,605.09/x
  3. Step 3: Cross multiply
    712,882.76x = 983,778.01 × 390,605.09
  4. Step 4: Simplify right side
    712,882.76x = 384,268,692,240.67
  5. Step 5: Solve for x
    x = 384,268,692,240.67/712,882.76
  6. Step 6: Final answer
    x = 539,034.91

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Double scale
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Similar ratio
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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.