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Finding the Fourth Proportional to 393,483.55, 589,003.55 and 213,121.01

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Solution

The fourth proportional to 393,483.55, 589,003.55 and 213,121.01 is: 319,019.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,483.55 : 589,003.55 = 213,121.01 : x
  2. Step 2: Convert to fraction form
    393,483.55/589,003.55 = 213,121.01/x
  3. Step 3: Cross multiply
    393,483.55x = 589,003.55 × 213,121.01
  4. Step 4: Simplify right side
    393,483.55x = 125,529,027,458.96
  5. Step 5: Solve for x
    x = 125,529,027,458.96/393,483.55
  6. Step 6: Final answer
    x = 319,019.76

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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.