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Finding the Fourth Proportional to 383,997.80, 530,116.18 and 280,515.80

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Solution

The fourth proportional to 383,997.80, 530,116.18 and 280,515.80 is: 387,257.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    383,997.80 : 530,116.18 = 280,515.80 : x
  2. Step 2: Convert to fraction form
    383,997.80/530,116.18 = 280,515.80/x
  3. Step 3: Cross multiply
    383,997.80x = 530,116.18 × 280,515.80
  4. Step 4: Simplify right side
    383,997.80x = 148,705,964,325.64
  5. Step 5: Solve for x
    x = 148,705,964,325.64/383,997.80
  6. Step 6: Final answer
    x = 387,257.33

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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.