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Finding the Fourth Proportional to 712,617.66, 983,412.60 and 390,333.12

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Solution

The fourth proportional to 712,617.66, 983,412.60 and 390,333.12 is: 538,659.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,617.66 : 983,412.60 = 390,333.12 : x
  2. Step 2: Convert to fraction form
    712,617.66/983,412.60 = 390,333.12/x
  3. Step 3: Cross multiply
    712,617.66x = 983,412.60 × 390,333.12
  4. Step 4: Simplify right side
    712,617.66x = 383,858,508,405.31
  5. Step 5: Solve for x
    x = 383,858,508,405.31/712,617.66
  6. Step 6: Final answer
    x = 538,659.83

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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.