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Finding the Fourth Proportional to 5,409.52, 7,459.72 and 3,990.80

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Solution

The fourth proportional to 5,409.52, 7,459.72 and 3,990.80 is: 5,503.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,409.52 : 7,459.72 = 3,990.80 : x
  2. Step 2: Convert to fraction form
    5,409.52/7,459.72 = 3,990.80/x
  3. Step 3: Cross multiply
    5,409.52x = 7,459.72 × 3,990.80
  4. Step 4: Simplify right side
    5,409.52x = 29,770,250.58
  5. Step 5: Solve for x
    x = 29,770,250.58/5,409.52
  6. Step 6: Final answer
    x = 5,503.31

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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.