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Finding the Fourth Proportional to 1,328,671, 1,992,987.78 and 618,301.72

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Solution

The fourth proportional to 1,328,671, 1,992,987.78 and 618,301.72 is: 927,443.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328,671 : 1,992,987.78 = 618,301.72 : x
  2. Step 2: Convert to fraction form
    1,328,671/1,992,987.78 = 618,301.72/x
  3. Step 3: Cross multiply
    1,328,671x = 1,992,987.78 × 618,301.72
  4. Step 4: Simplify right side
    1,328,671x = 1,232,267,772,312.98
  5. Step 5: Solve for x
    x = 1,232,267,772,312.98/1,328,671
  6. Step 6: Final answer
    x = 927,443.87

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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.