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Finding the Fourth Proportional to 28,121.45, 42,203.03 and 13,330.40

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Solution

The fourth proportional to 28,121.45, 42,203.03 and 13,330.40 is: 20,005.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,121.45 : 42,203.03 = 13,330.40 : x
  2. Step 2: Convert to fraction form
    28,121.45/42,203.03 = 13,330.40/x
  3. Step 3: Cross multiply
    28,121.45x = 42,203.03 × 13,330.40
  4. Step 4: Simplify right side
    28,121.45x = 562,582,993.44
  5. Step 5: Solve for x
    x = 562,582,993.44/28,121.45
  6. Step 6: Final answer
    x = 20,005.48

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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.