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Finding the Fourth Proportional to 61,636.80, 92,403.36 and 31,990.80

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Solution

The fourth proportional to 61,636.80, 92,403.36 and 31,990.80 is: 47,959.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,636.80 : 92,403.36 = 31,990.80 : x
  2. Step 2: Convert to fraction form
    61,636.80/92,403.36 = 31,990.80/x
  3. Step 3: Cross multiply
    61,636.80x = 92,403.36 × 31,990.80
  4. Step 4: Simplify right side
    61,636.80x = 2,956,057,409.09
  5. Step 5: Solve for x
    x = 2,956,057,409.09/61,636.80
  6. Step 6: Final answer
    x = 47,959.29

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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.