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Finding the Fourth Proportional to 80,622.40, 120,703.20 and 71,406.40

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Solution

The fourth proportional to 80,622.40, 120,703.20 and 71,406.40 is: 106,905.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,622.40 : 120,703.20 = 71,406.40 : x
  2. Step 2: Convert to fraction form
    80,622.40/120,703.20 = 71,406.40/x
  3. Step 3: Cross multiply
    80,622.40x = 120,703.20 × 71,406.40
  4. Step 4: Simplify right side
    80,622.40x = 8,618,980,980.48
  5. Step 5: Solve for x
    x = 8,618,980,980.48/80,622.40
  6. Step 6: Final answer
    x = 106,905.54

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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.