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Finding the Fourth Proportional to 391,415.47, 540,153.42 and 238,453.65

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Solution

The fourth proportional to 391,415.47, 540,153.42 and 238,453.65 is: 329,066.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,415.47 : 540,153.42 = 238,453.65 : x
  2. Step 2: Convert to fraction form
    391,415.47/540,153.42 = 238,453.65/x
  3. Step 3: Cross multiply
    391,415.47x = 540,153.42 × 238,453.65
  4. Step 4: Simplify right side
    391,415.47x = 128,801,554,558.98
  5. Step 5: Solve for x
    x = 128,801,554,558.98/391,415.47
  6. Step 6: Final answer
    x = 329,066.08

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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.