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Finding the Fourth Proportional to 85,495.68, 128,245.68 and 40,506.48

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Solution

The fourth proportional to 85,495.68, 128,245.68 and 40,506.48 is: 60,760.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,495.68 : 128,245.68 = 40,506.48 : x
  2. Step 2: Convert to fraction form
    85,495.68/128,245.68 = 40,506.48/x
  3. Step 3: Cross multiply
    85,495.68x = 128,245.68 × 40,506.48
  4. Step 4: Simplify right side
    85,495.68x = 5,194,781,072.01
  5. Step 5: Solve for x
    x = 5,194,781,072.01/85,495.68
  6. Step 6: Final answer
    x = 60,760.74

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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.