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Finding the Fourth Proportional to 715,448.85, 987,104.11 and 428,864.37

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Solution

The fourth proportional to 715,448.85, 987,104.11 and 428,864.37 is: 591,703.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,448.85 : 987,104.11 = 428,864.37 : x
  2. Step 2: Convert to fraction form
    715,448.85/987,104.11 = 428,864.37/x
  3. Step 3: Cross multiply
    715,448.85x = 987,104.11 × 428,864.37
  4. Step 4: Simplify right side
    715,448.85x = 423,333,782,259.56
  5. Step 5: Solve for x
    x = 423,333,782,259.56/715,448.85
  6. Step 6: Final answer
    x = 591,703.77

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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.