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Finding the Fourth Proportional to 8,811.36, 13,221.90 and 4,913.64

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Solution

The fourth proportional to 8,811.36, 13,221.90 and 4,913.64 is: 7,373.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,811.36 : 13,221.90 = 4,913.64 : x
  2. Step 2: Convert to fraction form
    8,811.36/13,221.90 = 4,913.64/x
  3. Step 3: Cross multiply
    8,811.36x = 13,221.90 × 4,913.64
  4. Step 4: Simplify right side
    8,811.36x = 64,967,656.72
  5. Step 5: Solve for x
    x = 64,967,656.72/8,811.36
  6. Step 6: Final answer
    x = 7,373.17

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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.