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Finding the Fourth Proportional to 515,905.99, 711,950.25 and 289,551.49

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Solution

The fourth proportional to 515,905.99, 711,950.25 and 289,551.49 is: 399,581.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,905.99 : 711,950.25 = 289,551.49 : x
  2. Step 2: Convert to fraction form
    515,905.99/711,950.25 = 289,551.49/x
  3. Step 3: Cross multiply
    515,905.99x = 711,950.25 × 289,551.49
  4. Step 4: Simplify right side
    515,905.99x = 206,146,255,693.37
  5. Step 5: Solve for x
    x = 206,146,255,693.37/515,905.99
  6. Step 6: Final answer
    x = 399,581.05

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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.