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Finding the Fourth Proportional to 30,629.80, 45,987.90 and 18,965.80

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Solution

The fourth proportional to 30,629.80, 45,987.90 and 18,965.80 is: 28,475.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,629.80 : 45,987.90 = 18,965.80 : x
  2. Step 2: Convert to fraction form
    30,629.80/45,987.90 = 18,965.80/x
  3. Step 3: Cross multiply
    30,629.80x = 45,987.90 × 18,965.80
  4. Step 4: Simplify right side
    30,629.80x = 872,197,313.82
  5. Step 5: Solve for x
    x = 872,197,313.82/30,629.80
  6. Step 6: Final answer
    x = 28,475.45

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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.