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Finding the Fourth Proportional to 259,661.20, 389,621.40 and 147,427.60

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Solution

The fourth proportional to 259,661.20, 389,621.40 and 147,427.60 is: 221,214.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,661.20 : 389,621.40 = 147,427.60 : x
  2. Step 2: Convert to fraction form
    259,661.20/389,621.40 = 147,427.60/x
  3. Step 3: Cross multiply
    259,661.20x = 389,621.40 × 147,427.60
  4. Step 4: Simplify right side
    259,661.20x = 57,440,947,910.64
  5. Step 5: Solve for x
    x = 57,440,947,910.64/259,661.20
  6. Step 6: Final answer
    x = 221,214.98

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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.