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Finding the Fourth Proportional to 8,764.40, 13,146.60 and 8,385.20

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Solution

The fourth proportional to 8,764.40, 13,146.60 and 8,385.20 is: 12,577.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,764.40 : 13,146.60 = 8,385.20 : x
  2. Step 2: Convert to fraction form
    8,764.40/13,146.60 = 8,385.20/x
  3. Step 3: Cross multiply
    8,764.40x = 13,146.60 × 8,385.20
  4. Step 4: Simplify right side
    8,764.40x = 110,236,870.32
  5. Step 5: Solve for x
    x = 110,236,870.32/8,764.40
  6. Step 6: Final answer
    x = 12,577.80

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Similar ratio
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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.