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Finding the Fourth Proportional to 8,348.56, 11,520.98 and 4,991.20

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Solution

The fourth proportional to 8,348.56, 11,520.98 and 4,991.20 is: 6,887.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,348.56 : 11,520.98 = 4,991.20 : x
  2. Step 2: Convert to fraction form
    8,348.56/11,520.98 = 4,991.20/x
  3. Step 3: Cross multiply
    8,348.56x = 11,520.98 × 4,991.20
  4. Step 4: Simplify right side
    8,348.56x = 57,503,515.38
  5. Step 5: Solve for x
    x = 57,503,515.38/8,348.56
  6. Step 6: Final answer
    x = 6,887.84

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Half scale
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Double scale
Find fourth proportional to 8,349.56, 11,522.36 and 4,992.20
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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.