Home / 30,946.08-42,690.06-20,861.76

Finding the Fourth Proportional to 30,946.08, 42,690.06 and 20,861.76

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Solution

The fourth proportional to 30,946.08, 42,690.06 and 20,861.76 is: 28,778.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,946.08 : 42,690.06 = 20,861.76 : x
  2. Step 2: Convert to fraction form
    30,946.08/42,690.06 = 20,861.76/x
  3. Step 3: Cross multiply
    30,946.08x = 42,690.06 × 20,861.76
  4. Step 4: Simplify right side
    30,946.08x = 890,589,786.11
  5. Step 5: Solve for x
    x = 890,589,786.11/30,946.08
  6. Step 6: Final answer
    x = 28,778.76

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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.