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Finding the Fourth Proportional to 819,561.30, 1,230,340.35 and 520,041.30

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Solution

The fourth proportional to 819,561.30, 1,230,340.35 and 520,041.30 is: 780,695.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,561.30 : 1,230,340.35 = 520,041.30 : x
  2. Step 2: Convert to fraction form
    819,561.30/1,230,340.35 = 520,041.30/x
  3. Step 3: Cross multiply
    819,561.30x = 1,230,340.35 × 520,041.30
  4. Step 4: Simplify right side
    819,561.30x = 639,827,795,056.46
  5. Step 5: Solve for x
    x = 639,827,795,056.46/819,561.30
  6. Step 6: Final answer
    x = 780,695.47

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.