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Finding the Fourth Proportional to 85,740.50, 128,630.20 and 30,336.50

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Solution

The fourth proportional to 85,740.50, 128,630.20 and 30,336.50 is: 45,511.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,740.50 : 128,630.20 = 30,336.50 : x
  2. Step 2: Convert to fraction form
    85,740.50/128,630.20 = 30,336.50/x
  3. Step 3: Cross multiply
    85,740.50x = 128,630.20 × 30,336.50
  4. Step 4: Simplify right side
    85,740.50x = 3,902,190,062.30
  5. Step 5: Solve for x
    x = 3,902,190,062.30/85,740.50
  6. Step 6: Final answer
    x = 45,511.63

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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.