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Finding the Fourth Proportional to 539,086.70, 808,630.05 and 139,724.30

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Solution

The fourth proportional to 539,086.70, 808,630.05 and 139,724.30 is: 209,586.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,086.70 : 808,630.05 = 139,724.30 : x
  2. Step 2: Convert to fraction form
    539,086.70/808,630.05 = 139,724.30/x
  3. Step 3: Cross multiply
    539,086.70x = 808,630.05 × 139,724.30
  4. Step 4: Simplify right side
    539,086.70x = 112,985,267,695.22
  5. Step 5: Solve for x
    x = 112,985,267,695.22/539,086.70
  6. Step 6: Final answer
    x = 209,586.45

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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.