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Finding the Fourth Proportional to 61,998.72, 92,985.12 and 20,436

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Solution

The fourth proportional to 61,998.72, 92,985.12 and 20,436 is: 30,649.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,998.72 : 92,985.12 = 20,436 : x
  2. Step 2: Convert to fraction form
    61,998.72/92,985.12 = 20,436/x
  3. Step 3: Cross multiply
    61,998.72x = 92,985.12 × 20,436
  4. Step 4: Simplify right side
    61,998.72x = 1,900,243,912.32
  5. Step 5: Solve for x
    x = 1,900,243,912.32/61,998.72
  6. Step 6: Final answer
    x = 30,649.73

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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.