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Finding the Fourth Proportional to 513,840.80, 770,761.20 and 139,863.20

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Solution

The fourth proportional to 513,840.80, 770,761.20 and 139,863.20 is: 209,794.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,840.80 : 770,761.20 = 139,863.20 : x
  2. Step 2: Convert to fraction form
    513,840.80/770,761.20 = 139,863.20/x
  3. Step 3: Cross multiply
    513,840.80x = 770,761.20 × 139,863.20
  4. Step 4: Simplify right side
    513,840.80x = 107,801,127,867.84
  5. Step 5: Solve for x
    x = 107,801,127,867.84/513,840.80
  6. Step 6: Final answer
    x = 209,794.80

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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.