Home / 64,989.20-89,647.68-39,129.77

Finding the Fourth Proportional to 64,989.20, 89,647.68 and 39,129.77

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Solution

The fourth proportional to 64,989.20, 89,647.68 and 39,129.77 is: 53,976.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,989.20 : 89,647.68 = 39,129.77 : x
  2. Step 2: Convert to fraction form
    64,989.20/89,647.68 = 39,129.77/x
  3. Step 3: Cross multiply
    64,989.20x = 89,647.68 × 39,129.77
  4. Step 4: Simplify right side
    64,989.20x = 3,507,893,099.43
  5. Step 5: Solve for x
    x = 3,507,893,099.43/64,989.20
  6. Step 6: Final answer
    x = 53,976.55

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Why These Related Problems?

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