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Finding the Fourth Proportional to 5,396.60, 7,447.32 and 3,128.39

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Solution

The fourth proportional to 5,396.60, 7,447.32 and 3,128.39 is: 4,317.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,396.60 : 7,447.32 = 3,128.39 : x
  2. Step 2: Convert to fraction form
    5,396.60/7,447.32 = 3,128.39/x
  3. Step 3: Cross multiply
    5,396.60x = 7,447.32 × 3,128.39
  4. Step 4: Simplify right side
    5,396.60x = 23,298,084.18
  5. Step 5: Solve for x
    x = 23,298,084.18/5,396.60
  6. Step 6: Final answer
    x = 4,317.18

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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.