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Finding the Fourth Proportional to 85,969.05, 128,971.80 and 25,992.60

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Solution

The fourth proportional to 85,969.05, 128,971.80 and 25,992.60 is: 38,994.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,969.05 : 128,971.80 = 25,992.60 : x
  2. Step 2: Convert to fraction form
    85,969.05/128,971.80 = 25,992.60/x
  3. Step 3: Cross multiply
    85,969.05x = 128,971.80 × 25,992.60
  4. Step 4: Simplify right side
    85,969.05x = 3,352,312,408.68
  5. Step 5: Solve for x
    x = 3,352,312,408.68/85,969.05
  6. Step 6: Final answer
    x = 38,994.41

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1.5x scale

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.