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Finding the Fourth Proportional to 85,405.70, 128,186.29 and 45,458.22

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Solution

The fourth proportional to 85,405.70, 128,186.29 and 45,458.22 is: 68,228.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.70 : 128,186.29 = 45,458.22 : x
  2. Step 2: Convert to fraction form
    85,405.70/128,186.29 = 45,458.22/x
  3. Step 3: Cross multiply
    85,405.70x = 128,186.29 × 45,458.22
  4. Step 4: Simplify right side
    85,405.70x = 5,827,120,571.80
  5. Step 5: Solve for x
    x = 5,827,120,571.80/85,405.70
  6. Step 6: Final answer
    x = 68,228.71

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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.