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Finding the Fourth Proportional to 28,178.94, 42,274.89 and 8,457.87

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Solution

The fourth proportional to 28,178.94, 42,274.89 and 8,457.87 is: 12,688.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,178.94 : 42,274.89 = 8,457.87 : x
  2. Step 2: Convert to fraction form
    28,178.94/42,274.89 = 8,457.87/x
  3. Step 3: Cross multiply
    28,178.94x = 42,274.89 × 8,457.87
  4. Step 4: Simplify right side
    28,178.94x = 357,555,523.88
  5. Step 5: Solve for x
    x = 357,555,523.88/28,178.94
  6. Step 6: Final answer
    x = 12,688.75

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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.