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Finding the Fourth Proportional to 391,883.31, 540,291.38 and 253,816.61

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Solution

The fourth proportional to 391,883.31, 540,291.38 and 253,816.61 is: 349,938.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,883.31 : 540,291.38 = 253,816.61 : x
  2. Step 2: Convert to fraction form
    391,883.31/540,291.38 = 253,816.61/x
  3. Step 3: Cross multiply
    391,883.31x = 540,291.38 × 253,816.61
  4. Step 4: Simplify right side
    391,883.31x = 137,134,922,513.28
  5. Step 5: Solve for x
    x = 137,134,922,513.28/391,883.31
  6. Step 6: Final answer
    x = 349,938.16

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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.