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Finding the Fourth Proportional to 11,120.80, 16,681.20 and 9,857.20

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Solution

The fourth proportional to 11,120.80, 16,681.20 and 9,857.20 is: 14,785.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,120.80 : 16,681.20 = 9,857.20 : x
  2. Step 2: Convert to fraction form
    11,120.80/16,681.20 = 9,857.20/x
  3. Step 3: Cross multiply
    11,120.80x = 16,681.20 × 9,857.20
  4. Step 4: Simplify right side
    11,120.80x = 164,429,924.64
  5. Step 5: Solve for x
    x = 164,429,924.64/11,120.80
  6. Step 6: Final answer
    x = 14,785.80

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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.