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Finding the Fourth Proportional to 8,911.20, 12,285.36 and 8,522.40

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Solution

The fourth proportional to 8,911.20, 12,285.36 and 8,522.40 is: 11,749.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,911.20 : 12,285.36 = 8,522.40 : x
  2. Step 2: Convert to fraction form
    8,911.20/12,285.36 = 8,522.40/x
  3. Step 3: Cross multiply
    8,911.20x = 12,285.36 × 8,522.40
  4. Step 4: Simplify right side
    8,911.20x = 104,700,752.06
  5. Step 5: Solve for x
    x = 104,700,752.06/8,911.20
  6. Step 6: Final answer
    x = 11,749.34

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Double scale
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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.