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Finding the Fourth Proportional to 85,704.94, 128,508.18 and 45,674.63

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Solution

The fourth proportional to 85,704.94, 128,508.18 and 45,674.63 is: 68,485.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,704.94 : 128,508.18 = 45,674.63 : x
  2. Step 2: Convert to fraction form
    85,704.94/128,508.18 = 45,674.63/x
  3. Step 3: Cross multiply
    85,704.94x = 128,508.18 × 45,674.63
  4. Step 4: Simplify right side
    85,704.94x = 5,869,563,573.47
  5. Step 5: Solve for x
    x = 5,869,563,573.47/85,704.94
  6. Step 6: Final answer
    x = 68,485.71

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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.