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Finding the Fourth Proportional to 8,420.72, 11,636.04 and 8,016.08

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Solution

The fourth proportional to 8,420.72, 11,636.04 and 8,016.08 is: 11,076.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.72 : 11,636.04 = 8,016.08 : x
  2. Step 2: Convert to fraction form
    8,420.72/11,636.04 = 8,016.08/x
  3. Step 3: Cross multiply
    8,420.72x = 11,636.04 × 8,016.08
  4. Step 4: Simplify right side
    8,420.72x = 93,275,427.52
  5. Step 5: Solve for x
    x = 93,275,427.52/8,420.72
  6. Step 6: Final answer
    x = 11,076.89

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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.