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Finding the Fourth Proportional to 72,621.40, 100,226.94 and 40,790.30

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Solution

The fourth proportional to 72,621.40, 100,226.94 and 40,790.30 is: 56,295.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,621.40 : 100,226.94 = 40,790.30 : x
  2. Step 2: Convert to fraction form
    72,621.40/100,226.94 = 40,790.30/x
  3. Step 3: Cross multiply
    72,621.40x = 100,226.94 × 40,790.30
  4. Step 4: Simplify right side
    72,621.40x = 4,088,286,950.68
  5. Step 5: Solve for x
    x = 4,088,286,950.68/72,621.40
  6. Step 6: Final answer
    x = 56,295.90

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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.