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Finding the Fourth Proportional to 40,989.73, 61,486.81 and 12,911.99

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Solution

The fourth proportional to 40,989.73, 61,486.81 and 12,911.99 is: 19,368.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,989.73 : 61,486.81 = 12,911.99 : x
  2. Step 2: Convert to fraction form
    40,989.73/61,486.81 = 12,911.99/x
  3. Step 3: Cross multiply
    40,989.73x = 61,486.81 × 12,911.99
  4. Step 4: Simplify right side
    40,989.73x = 793,917,075.85
  5. Step 5: Solve for x
    x = 793,917,075.85/40,989.73
  6. Step 6: Final answer
    x = 19,368.68

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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.