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Finding the Fourth Proportional to 72,912.80, 109,355.70 and 20,311.40

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Solution

The fourth proportional to 72,912.80, 109,355.70 and 20,311.40 is: 30,463.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.80 : 109,355.70 = 20,311.40 : x
  2. Step 2: Convert to fraction form
    72,912.80/109,355.70 = 20,311.40/x
  3. Step 3: Cross multiply
    72,912.80x = 109,355.70 × 20,311.40
  4. Step 4: Simplify right side
    72,912.80x = 2,221,167,364.98
  5. Step 5: Solve for x
    x = 2,221,167,364.98/72,912.80
  6. Step 6: Final answer
    x = 30,463.34

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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.