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Finding the Fourth Proportional to 520,072.60, 780,108.90 and 254,003.80

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Solution

The fourth proportional to 520,072.60, 780,108.90 and 254,003.80 is: 381,005.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,072.60 : 780,108.90 = 254,003.80 : x
  2. Step 2: Convert to fraction form
    520,072.60/780,108.90 = 254,003.80/x
  3. Step 3: Cross multiply
    520,072.60x = 780,108.90 × 254,003.80
  4. Step 4: Simplify right side
    520,072.60x = 198,150,625,013.82
  5. Step 5: Solve for x
    x = 198,150,625,013.82/520,072.60
  6. Step 6: Final answer
    x = 381,005.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.