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Finding the Fourth Proportional to 218,647.28, 327,761.76 and 85,483.28

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Solution

The fourth proportional to 218,647.28, 327,761.76 and 85,483.28 is: 128,143.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,647.28 : 327,761.76 = 85,483.28 : x
  2. Step 2: Convert to fraction form
    218,647.28/327,761.76 = 85,483.28/x
  3. Step 3: Cross multiply
    218,647.28x = 327,761.76 × 85,483.28
  4. Step 4: Simplify right side
    218,647.28x = 28,018,150,303.37
  5. Step 5: Solve for x
    x = 28,018,150,303.37/218,647.28
  6. Step 6: Final answer
    x = 128,143.15

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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.