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Finding the Fourth Proportional to 57,868.91, 86,774.64 and 18,420.89

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Solution

The fourth proportional to 57,868.91, 86,774.64 and 18,420.89 is: 27,622.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,868.91 : 86,774.64 = 18,420.89 : x
  2. Step 2: Convert to fraction form
    57,868.91/86,774.64 = 18,420.89/x
  3. Step 3: Cross multiply
    57,868.91x = 86,774.64 × 18,420.89
  4. Step 4: Simplify right side
    57,868.91x = 1,598,466,144.28
  5. Step 5: Solve for x
    x = 1,598,466,144.28/57,868.91
  6. Step 6: Final answer
    x = 27,622.19

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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.