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Finding the Fourth Proportional to 70,406.64, 105,616.44 and 20,484.72

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Solution

The fourth proportional to 70,406.64, 105,616.44 and 20,484.72 is: 30,728.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,406.64 : 105,616.44 = 20,484.72 : x
  2. Step 2: Convert to fraction form
    70,406.64/105,616.44 = 20,484.72/x
  3. Step 3: Cross multiply
    70,406.64x = 105,616.44 × 20,484.72
  4. Step 4: Simplify right side
    70,406.64x = 2,163,523,200.80
  5. Step 5: Solve for x
    x = 2,163,523,200.80/70,406.64
  6. Step 6: Final answer
    x = 30,728.97

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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.