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Finding the Fourth Proportional to 72,907.89, 109,361.88 and 20,318.76

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Solution

The fourth proportional to 72,907.89, 109,361.88 and 20,318.76 is: 30,478.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,907.89 : 109,361.88 = 20,318.76 : x
  2. Step 2: Convert to fraction form
    72,907.89/109,361.88 = 20,318.76/x
  3. Step 3: Cross multiply
    72,907.89x = 109,361.88 × 20,318.76
  4. Step 4: Simplify right side
    72,907.89x = 2,222,097,792.87
  5. Step 5: Solve for x
    x = 2,222,097,792.87/72,907.89
  6. Step 6: Final answer
    x = 30,478.15

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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.