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Finding the Fourth Proportional to 79,647.12, 109,922.40 and 47,815.20

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Solution

The fourth proportional to 79,647.12, 109,922.40 and 47,815.20 is: 65,990.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,647.12 : 109,922.40 = 47,815.20 : x
  2. Step 2: Convert to fraction form
    79,647.12/109,922.40 = 47,815.20/x
  3. Step 3: Cross multiply
    79,647.12x = 109,922.40 × 47,815.20
  4. Step 4: Simplify right side
    79,647.12x = 5,255,961,540.48
  5. Step 5: Solve for x
    x = 5,255,961,540.48/79,647.12
  6. Step 6: Final answer
    x = 65,990.60

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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.