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Finding the Fourth Proportional to 43,840.80, 65,890.80 and 38,138.40

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Solution

The fourth proportional to 43,840.80, 65,890.80 and 38,138.40 is: 57,320.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,840.80 : 65,890.80 = 38,138.40 : x
  2. Step 2: Convert to fraction form
    43,840.80/65,890.80 = 38,138.40/x
  3. Step 3: Cross multiply
    43,840.80x = 65,890.80 × 38,138.40
  4. Step 4: Simplify right side
    43,840.80x = 2,512,969,686.72
  5. Step 5: Solve for x
    x = 2,512,969,686.72/43,840.80
  6. Step 6: Final answer
    x = 57,320.34

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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.