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Finding the Fourth Proportional to 515,402.67, 711,291.20 and 289,062.75

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Solution

The fourth proportional to 515,402.67, 711,291.20 and 289,062.75 is: 398,926.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,402.67 : 711,291.20 = 289,062.75 : x
  2. Step 2: Convert to fraction form
    515,402.67/711,291.20 = 289,062.75/x
  3. Step 3: Cross multiply
    515,402.67x = 711,291.20 × 289,062.75
  4. Step 4: Simplify right side
    515,402.67x = 205,607,788,877.49
  5. Step 5: Solve for x
    x = 205,607,788,877.49/515,402.67
  6. Step 6: Final answer
    x = 398,926.51

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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.