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Finding the Fourth Proportional to 283,978.13, 391,897.18 and 154,918.70

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Solution

The fourth proportional to 283,978.13, 391,897.18 and 154,918.70 is: 213,791.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,978.13 : 391,897.18 = 154,918.70 : x
  2. Step 2: Convert to fraction form
    283,978.13/391,897.18 = 154,918.70/x
  3. Step 3: Cross multiply
    283,978.13x = 391,897.18 × 154,918.70
  4. Step 4: Simplify right side
    283,978.13x = 60,712,201,363.04
  5. Step 5: Solve for x
    x = 60,712,201,363.04/283,978.13
  6. Step 6: Final answer
    x = 213,791.82

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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.