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Finding the Fourth Proportional to 72,114.80, 108,172.20 and 47,231.60

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Solution

The fourth proportional to 72,114.80, 108,172.20 and 47,231.60 is: 70,847.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,114.80 : 108,172.20 = 47,231.60 : x
  2. Step 2: Convert to fraction form
    72,114.80/108,172.20 = 47,231.60/x
  3. Step 3: Cross multiply
    72,114.80x = 108,172.20 × 47,231.60
  4. Step 4: Simplify right side
    72,114.80x = 5,109,146,081.52
  5. Step 5: Solve for x
    x = 5,109,146,081.52/72,114.80
  6. Step 6: Final answer
    x = 70,847.40

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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.