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Finding the Fourth Proportional to 30,605.20, 45,820.20 and 18,839.20

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Solution

The fourth proportional to 30,605.20, 45,820.20 and 18,839.20 is: 28,204.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,605.20 : 45,820.20 = 18,839.20 : x
  2. Step 2: Convert to fraction form
    30,605.20/45,820.20 = 18,839.20/x
  3. Step 3: Cross multiply
    30,605.20x = 45,820.20 × 18,839.20
  4. Step 4: Simplify right side
    30,605.20x = 863,215,911.84
  5. Step 5: Solve for x
    x = 863,215,911.84/30,605.20
  6. Step 6: Final answer
    x = 28,204.88

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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.