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Finding the Fourth Proportional to 19,307.56, 28,965.59 and 10,991.50

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Solution

The fourth proportional to 19,307.56, 28,965.59 and 10,991.50 is: 16,489.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,307.56 : 28,965.59 = 10,991.50 : x
  2. Step 2: Convert to fraction form
    19,307.56/28,965.59 = 10,991.50/x
  3. Step 3: Cross multiply
    19,307.56x = 28,965.59 × 10,991.50
  4. Step 4: Simplify right side
    19,307.56x = 318,375,282.49
  5. Step 5: Solve for x
    x = 318,375,282.49/19,307.56
  6. Step 6: Final answer
    x = 16,489.67

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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.