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Finding the Fourth Proportional to 212,403.20, 318,619.20 and 72,172.40

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Solution

The fourth proportional to 212,403.20, 318,619.20 and 72,172.40 is: 108,263.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,403.20 : 318,619.20 = 72,172.40 : x
  2. Step 2: Convert to fraction form
    212,403.20/318,619.20 = 72,172.40/x
  3. Step 3: Cross multiply
    212,403.20x = 318,619.20 × 72,172.40
  4. Step 4: Simplify right side
    212,403.20x = 22,995,512,350.08
  5. Step 5: Solve for x
    x = 22,995,512,350.08/212,403.20
  6. Step 6: Final answer
    x = 108,263.49

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.