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Finding the Fourth Proportional to 70,485.92, 105,745.12 and 40,928.48

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Solution

The fourth proportional to 70,485.92, 105,745.12 and 40,928.48 is: 61,402.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,485.92 : 105,745.12 = 40,928.48 : x
  2. Step 2: Convert to fraction form
    70,485.92/105,745.12 = 40,928.48/x
  3. Step 3: Cross multiply
    70,485.92x = 105,745.12 × 40,928.48
  4. Step 4: Simplify right side
    70,485.92x = 4,327,987,029.02
  5. Step 5: Solve for x
    x = 4,327,987,029.02/70,485.92
  6. Step 6: Final answer
    x = 61,402.15

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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.