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Finding the Fourth Proportional to 11,855.64, 16,360.80 and 6,820.20

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Solution

The fourth proportional to 11,855.64, 16,360.80 and 6,820.20 is: 9,411.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,855.64 : 16,360.80 = 6,820.20 : x
  2. Step 2: Convert to fraction form
    11,855.64/16,360.80 = 6,820.20/x
  3. Step 3: Cross multiply
    11,855.64x = 16,360.80 × 6,820.20
  4. Step 4: Simplify right side
    11,855.64x = 111,583,928.16
  5. Step 5: Solve for x
    x = 111,583,928.16/11,855.64
  6. Step 6: Final answer
    x = 9,411.89

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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.