Home / 30,735.60-42,404.63-18,639.78

Finding the Fourth Proportional to 30,735.60, 42,404.63 and 18,639.78

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Solution

The fourth proportional to 30,735.60, 42,404.63 and 18,639.78 is: 25,716.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,735.60 : 42,404.63 = 18,639.78 : x
  2. Step 2: Convert to fraction form
    30,735.60/42,404.63 = 18,639.78/x
  3. Step 3: Cross multiply
    30,735.60x = 42,404.63 × 18,639.78
  4. Step 4: Simplify right side
    30,735.60x = 790,412,880.98
  5. Step 5: Solve for x
    x = 790,412,880.98/30,735.60
  6. Step 6: Final answer
    x = 25,716.53

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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.