Home / 18,811.96-28,211.40-7,715.50

Finding the Fourth Proportional to 18,811.96, 28,211.40 and 7,715.50

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Solution

The fourth proportional to 18,811.96, 28,211.40 and 7,715.50 is: 11,570.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.96 : 28,211.40 = 7,715.50 : x
  2. Step 2: Convert to fraction form
    18,811.96/28,211.40 = 7,715.50/x
  3. Step 3: Cross multiply
    18,811.96x = 28,211.40 × 7,715.50
  4. Step 4: Simplify right side
    18,811.96x = 217,665,056.70
  5. Step 5: Solve for x
    x = 217,665,056.70/18,811.96
  6. Step 6: Final answer
    x = 11,570.57

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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.