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Finding the Fourth Proportional to 19,999.55, 29,973.35 and 8,139.50

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Solution

The fourth proportional to 19,999.55, 29,973.35 and 8,139.50 is: 12,198.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.55 : 29,973.35 = 8,139.50 : x
  2. Step 2: Convert to fraction form
    19,999.55/29,973.35 = 8,139.50/x
  3. Step 3: Cross multiply
    19,999.55x = 29,973.35 × 8,139.50
  4. Step 4: Simplify right side
    19,999.55x = 243,967,952.81
  5. Step 5: Solve for x
    x = 243,967,952.81/19,999.55
  6. Step 6: Final answer
    x = 12,198.67

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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.