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Finding the Fourth Proportional to 29,972.80, 45,007.80 and 20,155.60

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Solution

The fourth proportional to 29,972.80, 45,007.80 and 20,155.60 is: 30,266.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,972.80 : 45,007.80 = 20,155.60 : x
  2. Step 2: Convert to fraction form
    29,972.80/45,007.80 = 20,155.60/x
  3. Step 3: Cross multiply
    29,972.80x = 45,007.80 × 20,155.60
  4. Step 4: Simplify right side
    29,972.80x = 907,159,213.68
  5. Step 5: Solve for x
    x = 907,159,213.68/29,972.80
  6. Step 6: Final answer
    x = 30,266.08

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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.