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Finding the Fourth Proportional to 3,619.60, 5,430.10 and 1,539.60

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Solution

The fourth proportional to 3,619.60, 5,430.10 and 1,539.60 is: 2,309.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,619.60 : 5,430.10 = 1,539.60 : x
  2. Step 2: Convert to fraction form
    3,619.60/5,430.10 = 1,539.60/x
  3. Step 3: Cross multiply
    3,619.60x = 5,430.10 × 1,539.60
  4. Step 4: Simplify right side
    3,619.60x = 8,360,181.96
  5. Step 5: Solve for x
    x = 8,360,181.96/3,619.60
  6. Step 6: Final answer
    x = 2,309.70

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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.