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Finding the Fourth Proportional to 715,775, 987,788.41 and 389,109.99

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Solution

The fourth proportional to 715,775, 987,788.41 and 389,109.99 is: 536,982.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,775 : 987,788.41 = 389,109.99 : x
  2. Step 2: Convert to fraction form
    715,775/987,788.41 = 389,109.99/x
  3. Step 3: Cross multiply
    715,775x = 987,788.41 × 389,109.99
  4. Step 4: Simplify right side
    715,775x = 384,358,338,337.22
  5. Step 5: Solve for x
    x = 384,358,338,337.22/715,775
  6. Step 6: Final answer
    x = 536,982.07

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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.