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Finding the Fourth Proportional to 515,451.80, 711,359 and 289,111.88

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Solution

The fourth proportional to 515,451.80, 711,359 and 289,111.88 is: 398,994.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,451.80 : 711,359 = 289,111.88 : x
  2. Step 2: Convert to fraction form
    515,451.80/711,359 = 289,111.88/x
  3. Step 3: Cross multiply
    515,451.80x = 711,359 × 289,111.88
  4. Step 4: Simplify right side
    515,451.80x = 205,662,337,844.92
  5. Step 5: Solve for x
    x = 205,662,337,844.92/515,451.80
  6. Step 6: Final answer
    x = 398,994.31

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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.