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Finding the Fourth Proportional to 259,889.76, 389,990.16 and 112,145.76

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Solution

The fourth proportional to 259,889.76, 389,990.16 and 112,145.76 is: 168,285.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,889.76 : 389,990.16 = 112,145.76 : x
  2. Step 2: Convert to fraction form
    259,889.76/389,990.16 = 112,145.76/x
  3. Step 3: Cross multiply
    259,889.76x = 389,990.16 × 112,145.76
  4. Step 4: Simplify right side
    259,889.76x = 43,735,742,885.72
  5. Step 5: Solve for x
    x = 43,735,742,885.72/259,889.76
  6. Step 6: Final answer
    x = 168,285.75

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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.