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Finding the Fourth Proportional to 115,978.33, 173,672.11 and 76,415.53

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Solution

The fourth proportional to 115,978.33, 173,672.11 and 76,415.53 is: 114,428.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,978.33 : 173,672.11 = 76,415.53 : x
  2. Step 2: Convert to fraction form
    115,978.33/173,672.11 = 76,415.53/x
  3. Step 3: Cross multiply
    115,978.33x = 173,672.11 × 76,415.53
  4. Step 4: Simplify right side
    115,978.33x = 13,271,246,331.87
  5. Step 5: Solve for x
    x = 13,271,246,331.87/115,978.33
  6. Step 6: Final answer
    x = 114,428.67

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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.