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Finding the Fourth Proportional to 55,872.75, 83,861.79 and 20,368.40

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Solution

The fourth proportional to 55,872.75, 83,861.79 and 20,368.40 is: 30,571.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,872.75 : 83,861.79 = 20,368.40 : x
  2. Step 2: Convert to fraction form
    55,872.75/83,861.79 = 20,368.40/x
  3. Step 3: Cross multiply
    55,872.75x = 83,861.79 × 20,368.40
  4. Step 4: Simplify right side
    55,872.75x = 1,708,130,483.44
  5. Step 5: Solve for x
    x = 1,708,130,483.44/55,872.75
  6. Step 6: Final answer
    x = 30,571.80

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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.