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Finding the Fourth Proportional to 18,885.76, 28,328.48 and 7,039.15

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Solution

The fourth proportional to 18,885.76, 28,328.48 and 7,039.15 is: 10,558.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.76 : 28,328.48 = 7,039.15 : x
  2. Step 2: Convert to fraction form
    18,885.76/28,328.48 = 7,039.15/x
  3. Step 3: Cross multiply
    18,885.76x = 28,328.48 × 7,039.15
  4. Step 4: Simplify right side
    18,885.76x = 199,408,539.31
  5. Step 5: Solve for x
    x = 199,408,539.31/18,885.76
  6. Step 6: Final answer
    x = 10,558.67

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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.