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Finding the Fourth Proportional to 78,636.96, 108,540 and 48,427.20

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Solution

The fourth proportional to 78,636.96, 108,540 and 48,427.20 is: 66,842.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,636.96 : 108,540 = 48,427.20 : x
  2. Step 2: Convert to fraction form
    78,636.96/108,540 = 48,427.20/x
  3. Step 3: Cross multiply
    78,636.96x = 108,540 × 48,427.20
  4. Step 4: Simplify right side
    78,636.96x = 5,256,288,288
  5. Step 5: Solve for x
    x = 5,256,288,288/78,636.96
  6. Step 6: Final answer
    x = 66,842.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.