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Finding the Fourth Proportional to 1,578,912, 2,178,950.40 and 863,520

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Solution

The fourth proportional to 1,578,912, 2,178,950.40 and 863,520 is: 1,191,685.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578,912 : 2,178,950.40 = 863,520 : x
  2. Step 2: Convert to fraction form
    1,578,912/2,178,950.40 = 863,520/x
  3. Step 3: Cross multiply
    1,578,912x = 2,178,950.40 × 863,520
  4. Step 4: Simplify right side
    1,578,912x = 1,881,567,249,408
  5. Step 5: Solve for x
    x = 1,881,567,249,408/1,578,912
  6. Step 6: Final answer
    x = 1,191,685.95

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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.