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Finding the Fourth Proportional to 89,438.40, 134,042.40 and 68,558.40

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Solution

The fourth proportional to 89,438.40, 134,042.40 and 68,558.40 is: 102,749.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,438.40 : 134,042.40 = 68,558.40 : x
  2. Step 2: Convert to fraction form
    89,438.40/134,042.40 = 68,558.40/x
  3. Step 3: Cross multiply
    89,438.40x = 134,042.40 × 68,558.40
  4. Step 4: Simplify right side
    89,438.40x = 9,189,732,476.16
  5. Step 5: Solve for x
    x = 9,189,732,476.16/89,438.40
  6. Step 6: Final answer
    x = 102,749.29

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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.