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Finding the Fourth Proportional to 78,995.80, 109,015.50 and 47,167.48

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Solution

The fourth proportional to 78,995.80, 109,015.50 and 47,167.48 is: 65,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,995.80 : 109,015.50 = 47,167.48 : x
  2. Step 2: Convert to fraction form
    78,995.80/109,015.50 = 47,167.48/x
  3. Step 3: Cross multiply
    78,995.80x = 109,015.50 × 47,167.48
  4. Step 4: Simplify right side
    78,995.80x = 5,141,986,415.94
  5. Step 5: Solve for x
    x = 5,141,986,415.94/78,995.80
  6. Step 6: Final answer
    x = 65,091.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.