Home / 100,979.76-151,470-30,858.78

Finding the Fourth Proportional to 100,979.76, 151,470 and 30,858.78

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Solution

The fourth proportional to 100,979.76, 151,470 and 30,858.78 is: 46,288.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.76 : 151,470 = 30,858.78 : x
  2. Step 2: Convert to fraction form
    100,979.76/151,470 = 30,858.78/x
  3. Step 3: Cross multiply
    100,979.76x = 151,470 × 30,858.78
  4. Step 4: Simplify right side
    100,979.76x = 4,674,179,406.60
  5. Step 5: Solve for x
    x = 4,674,179,406.60/100,979.76
  6. Step 6: Final answer
    x = 46,288.28

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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.