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Finding the Fourth Proportional to 8,420.55, 11,619.46 and 4,643.46

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Solution

The fourth proportional to 8,420.55, 11,619.46 and 4,643.46 is: 6,407.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.55 : 11,619.46 = 4,643.46 : x
  2. Step 2: Convert to fraction form
    8,420.55/11,619.46 = 4,643.46/x
  3. Step 3: Cross multiply
    8,420.55x = 11,619.46 × 4,643.46
  4. Step 4: Simplify right side
    8,420.55x = 53,954,497.73
  5. Step 5: Solve for x
    x = 53,954,497.73/8,420.55
  6. Step 6: Final answer
    x = 6,407.48

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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.