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Finding the Fourth Proportional to 19,991.61, 29,965.55 and 12,599.55

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Solution

The fourth proportional to 19,991.61, 29,965.55 and 12,599.55 is: 18,885.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.61 : 29,965.55 = 12,599.55 : x
  2. Step 2: Convert to fraction form
    19,991.61/29,965.55 = 12,599.55/x
  3. Step 3: Cross multiply
    19,991.61x = 29,965.55 × 12,599.55
  4. Step 4: Simplify right side
    19,991.61x = 377,552,382.50
  5. Step 5: Solve for x
    x = 377,552,382.50/19,991.61
  6. Step 6: Final answer
    x = 18,885.54

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1.5x scale

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.