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Finding the Fourth Proportional to 78,963.63, 108,971.25 and 43,155.15

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Solution

The fourth proportional to 78,963.63, 108,971.25 and 43,155.15 is: 59,554.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,963.63 : 108,971.25 = 43,155.15 : x
  2. Step 2: Convert to fraction form
    78,963.63/108,971.25 = 43,155.15/x
  3. Step 3: Cross multiply
    78,963.63x = 108,971.25 × 43,155.15
  4. Step 4: Simplify right side
    78,963.63x = 4,702,670,639.44
  5. Step 5: Solve for x
    x = 4,702,670,639.44/78,963.63
  6. Step 6: Final answer
    x = 59,554.89

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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.