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Finding the Fourth Proportional to 515,378.16, 711,220.50 and 289,028.52

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Solution

The fourth proportional to 515,378.16, 711,220.50 and 289,028.52 is: 398,858.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,378.16 : 711,220.50 = 289,028.52 : x
  2. Step 2: Convert to fraction form
    515,378.16/711,220.50 = 289,028.52/x
  3. Step 3: Cross multiply
    515,378.16x = 711,220.50 × 289,028.52
  4. Step 4: Simplify right side
    515,378.16x = 205,563,008,508.66
  5. Step 5: Solve for x
    x = 205,563,008,508.66/515,378.16
  6. Step 6: Final answer
    x = 398,858.59

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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.