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Finding the Fourth Proportional to 92,145.78, 138,218.57 and 28,971.42

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Solution

The fourth proportional to 92,145.78, 138,218.57 and 28,971.42 is: 43,457.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,145.78 : 138,218.57 = 28,971.42 : x
  2. Step 2: Convert to fraction form
    92,145.78/138,218.57 = 28,971.42/x
  3. Step 3: Cross multiply
    92,145.78x = 138,218.57 × 28,971.42
  4. Step 4: Simplify right side
    92,145.78x = 4,004,388,854.95
  5. Step 5: Solve for x
    x = 4,004,388,854.95/92,145.78
  6. Step 6: Final answer
    x = 43,457.11

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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.