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Finding the Fourth Proportional to 8,915.70, 12,301.77 and 5,378.85

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Solution

The fourth proportional to 8,915.70, 12,301.77 and 5,378.85 is: 7,421.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.70 : 12,301.77 = 5,378.85 : x
  2. Step 2: Convert to fraction form
    8,915.70/12,301.77 = 5,378.85/x
  3. Step 3: Cross multiply
    8,915.70x = 12,301.77 × 5,378.85
  4. Step 4: Simplify right side
    8,915.70x = 66,169,375.56
  5. Step 5: Solve for x
    x = 66,169,375.56/8,915.70
  6. Step 6: Final answer
    x = 7,421.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.