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Finding the Fourth Proportional to 84,646.87, 126,989.81 and 28,485.50

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Solution

The fourth proportional to 84,646.87, 126,989.81 and 28,485.50 is: 42,734.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,646.87 : 126,989.81 = 28,485.50 : x
  2. Step 2: Convert to fraction form
    84,646.87/126,989.81 = 28,485.50/x
  3. Step 3: Cross multiply
    84,646.87x = 126,989.81 × 28,485.50
  4. Step 4: Simplify right side
    84,646.87x = 3,617,368,662.88
  5. Step 5: Solve for x
    x = 3,617,368,662.88/84,646.87
  6. Step 6: Final answer
    x = 42,734.82

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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.