Home / 78,020.28-117,029.88-31,272.48

Finding the Fourth Proportional to 78,020.28, 117,029.88 and 31,272.48

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Solution

The fourth proportional to 78,020.28, 117,029.88 and 31,272.48 is: 46,908.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,020.28 : 117,029.88 = 31,272.48 : x
  2. Step 2: Convert to fraction form
    78,020.28/117,029.88 = 31,272.48/x
  3. Step 3: Cross multiply
    78,020.28x = 117,029.88 × 31,272.48
  4. Step 4: Simplify right side
    78,020.28x = 3,659,814,581.70
  5. Step 5: Solve for x
    x = 3,659,814,581.70/78,020.28
  6. Step 6: Final answer
    x = 46,908.50

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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.