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Finding the Fourth Proportional to 128,492.85, 177,150.25 and 105,438.23

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Solution

The fourth proportional to 128,492.85, 177,150.25 and 105,438.23 is: 145,365.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,492.85 : 177,150.25 = 105,438.23 : x
  2. Step 2: Convert to fraction form
    128,492.85/177,150.25 = 105,438.23/x
  3. Step 3: Cross multiply
    128,492.85x = 177,150.25 × 105,438.23
  4. Step 4: Simplify right side
    128,492.85x = 18,678,408,804.06
  5. Step 5: Solve for x
    x = 18,678,408,804.06/128,492.85
  6. Step 6: Final answer
    x = 145,365.36

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.