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Finding the Fourth Proportional to 30,409.60, 45,643.20 and 18,745.60

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Solution

The fourth proportional to 30,409.60, 45,643.20 and 18,745.60 is: 28,136.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,409.60 : 45,643.20 = 18,745.60 : x
  2. Step 2: Convert to fraction form
    30,409.60/45,643.20 = 18,745.60/x
  3. Step 3: Cross multiply
    30,409.60x = 45,643.20 × 18,745.60
  4. Step 4: Simplify right side
    30,409.60x = 855,609,169.92
  5. Step 5: Solve for x
    x = 855,609,169.92/30,409.60
  6. Step 6: Final answer
    x = 28,136.15

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1.5x scale

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.