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Finding the Fourth Proportional to 1,398,398.08, 1,929,846.96 and 786,579.40

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Solution

The fourth proportional to 1,398,398.08, 1,929,846.96 and 786,579.40 is: 1,085,511.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398,398.08 : 1,929,846.96 = 786,579.40 : x
  2. Step 2: Convert to fraction form
    1,398,398.08/1,929,846.96 = 786,579.40/x
  3. Step 3: Cross multiply
    1,398,398.08x = 1,929,846.96 × 786,579.40
  4. Step 4: Simplify right side
    1,398,398.08x = 1,517,977,863,888.62
  5. Step 5: Solve for x
    x = 1,517,977,863,888.62/1,398,398.08
  6. Step 6: Final answer
    x = 1,085,511.98

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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.