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Finding the Fourth Proportional to 8,840.20, 13,238.70 and 8,451.40

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Solution

The fourth proportional to 8,840.20, 13,238.70 and 8,451.40 is: 12,656.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,840.20 : 13,238.70 = 8,451.40 : x
  2. Step 2: Convert to fraction form
    8,840.20/13,238.70 = 8,451.40/x
  3. Step 3: Cross multiply
    8,840.20x = 13,238.70 × 8,451.40
  4. Step 4: Simplify right side
    8,840.20x = 111,885,549.18
  5. Step 5: Solve for x
    x = 111,885,549.18/8,840.20
  6. Step 6: Final answer
    x = 12,656.45

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Half scale
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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.