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Finding the Fourth Proportional to 78,086.44, 117,142.62 and 31,313.80

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Solution

The fourth proportional to 78,086.44, 117,142.62 and 31,313.80 is: 46,975.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,086.44 : 117,142.62 = 31,313.80 : x
  2. Step 2: Convert to fraction form
    78,086.44/117,142.62 = 31,313.80/x
  3. Step 3: Cross multiply
    78,086.44x = 117,142.62 × 31,313.80
  4. Step 4: Simplify right side
    78,086.44x = 3,668,180,574.16
  5. Step 5: Solve for x
    x = 3,668,180,574.16/78,086.44
  6. Step 6: Final answer
    x = 46,975.90

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1.5x scale

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.