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Finding the Fourth Proportional to 171,911.20, 257,931.60 and 83,243.20

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Solution

The fourth proportional to 171,911.20, 257,931.60 and 83,243.20 is: 124,896.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,911.20 : 257,931.60 = 83,243.20 : x
  2. Step 2: Convert to fraction form
    171,911.20/257,931.60 = 83,243.20/x
  3. Step 3: Cross multiply
    171,911.20x = 257,931.60 × 83,243.20
  4. Step 4: Simplify right side
    171,911.20x = 21,471,051,765.12
  5. Step 5: Solve for x
    x = 21,471,051,765.12/171,911.20
  6. Step 6: Final answer
    x = 124,896.18

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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.