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Finding the Fourth Proportional to 70,589.60, 105,961.20 and 39,485.60

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Solution

The fourth proportional to 70,589.60, 105,961.20 and 39,485.60 is: 59,271.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,589.60 : 105,961.20 = 39,485.60 : x
  2. Step 2: Convert to fraction form
    70,589.60/105,961.20 = 39,485.60/x
  3. Step 3: Cross multiply
    70,589.60x = 105,961.20 × 39,485.60
  4. Step 4: Simplify right side
    70,589.60x = 4,183,941,558.72
  5. Step 5: Solve for x
    x = 4,183,941,558.72/70,589.60
  6. Step 6: Final answer
    x = 59,271.36

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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.