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Finding the Fourth Proportional to 515,854.89, 711,945.42 and 289,500.39

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Solution

The fourth proportional to 515,854.89, 711,945.42 and 289,500.39 is: 399,547.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,854.89 : 711,945.42 = 289,500.39 : x
  2. Step 2: Convert to fraction form
    515,854.89/711,945.42 = 289,500.39/x
  3. Step 3: Cross multiply
    515,854.89x = 711,945.42 × 289,500.39
  4. Step 4: Simplify right side
    515,854.89x = 206,108,476,748.71
  5. Step 5: Solve for x
    x = 206,108,476,748.71/515,854.89
  6. Step 6: Final answer
    x = 399,547.39

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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.