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Finding the Fourth Proportional to 520,005.57, 717,612.42 and 305,149.21

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Solution

The fourth proportional to 520,005.57, 717,612.42 and 305,149.21 is: 421,108.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,005.57 : 717,612.42 = 305,149.21 : x
  2. Step 2: Convert to fraction form
    520,005.57/717,612.42 = 305,149.21/x
  3. Step 3: Cross multiply
    520,005.57x = 717,612.42 × 305,149.21
  4. Step 4: Simplify right side
    520,005.57x = 218,978,863,049.19
  5. Step 5: Solve for x
    x = 218,978,863,049.19/520,005.57
  6. Step 6: Final answer
    x = 421,108.69

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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.