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Finding the Fourth Proportional to 70,399.40, 105,615.68 and 20,480.60

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Solution

The fourth proportional to 70,399.40, 105,615.68 and 20,480.60 is: 30,725.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,399.40 : 105,615.68 = 20,480.60 : x
  2. Step 2: Convert to fraction form
    70,399.40/105,615.68 = 20,480.60/x
  3. Step 3: Cross multiply
    70,399.40x = 105,615.68 × 20,480.60
  4. Step 4: Simplify right side
    70,399.40x = 2,163,072,495.81
  5. Step 5: Solve for x
    x = 2,163,072,495.81/70,399.40
  6. Step 6: Final answer
    x = 30,725.72

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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.