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Finding the Fourth Proportional to 57,628, 86,442 and 18,716

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Solution

The fourth proportional to 57,628, 86,442 and 18,716 is: 28,074

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,628 : 86,442 = 18,716 : x
  2. Step 2: Convert to fraction form
    57,628/86,442 = 18,716/x
  3. Step 3: Cross multiply
    57,628x = 86,442 × 18,716
  4. Step 4: Simplify right side
    57,628x = 1,617,848,472
  5. Step 5: Solve for x
    x = 1,617,848,472/57,628
  6. Step 6: Final answer
    x = 28,074

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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.