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Finding the Fourth Proportional to 8,913.72, 12,291.38 and 7,512.85

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Solution

The fourth proportional to 8,913.72, 12,291.38 and 7,512.85 is: 10,359.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,913.72 : 12,291.38 = 7,512.85 : x
  2. Step 2: Convert to fraction form
    8,913.72/12,291.38 = 7,512.85/x
  3. Step 3: Cross multiply
    8,913.72x = 12,291.38 × 7,512.85
  4. Step 4: Simplify right side
    8,913.72x = 92,343,225.94
  5. Step 5: Solve for x
    x = 92,343,225.94/8,913.72
  6. Step 6: Final answer
    x = 10,359.67

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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.