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Finding the Fourth Proportional to 1,272,642, 1,908,974.52 and 386,178

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Solution

The fourth proportional to 1,272,642, 1,908,974.52 and 386,178 is: 579,270.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272,642 : 1,908,974.52 = 386,178 : x
  2. Step 2: Convert to fraction form
    1,272,642/1,908,974.52 = 386,178/x
  3. Step 3: Cross multiply
    1,272,642x = 1,908,974.52 × 386,178
  4. Step 4: Simplify right side
    1,272,642x = 737,203,962,184.56
  5. Step 5: Solve for x
    x = 737,203,962,184.56/1,272,642
  6. Step 6: Final answer
    x = 579,270.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.