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Finding the Fourth Proportional to 715,813.88, 987,764.39 and 421,416.86

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Solution

The fourth proportional to 715,813.88, 987,764.39 and 421,416.86 is: 581,520.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,813.88 : 987,764.39 = 421,416.86 : x
  2. Step 2: Convert to fraction form
    715,813.88/987,764.39 = 421,416.86/x
  3. Step 3: Cross multiply
    715,813.88x = 987,764.39 × 421,416.86
  4. Step 4: Simplify right side
    715,813.88x = 416,260,568,015.94
  5. Step 5: Solve for x
    x = 416,260,568,015.94/715,813.88
  6. Step 6: Final answer
    x = 581,520.67

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1.5x scale

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.