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Finding the Fourth Proportional to 78,915.05, 108,905.39 and 43,108.40

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Solution

The fourth proportional to 78,915.05, 108,905.39 and 43,108.40 is: 59,491.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.05 : 108,905.39 = 43,108.40 : x
  2. Step 2: Convert to fraction form
    78,915.05/108,905.39 = 43,108.40/x
  3. Step 3: Cross multiply
    78,915.05x = 108,905.39 × 43,108.40
  4. Step 4: Simplify right side
    78,915.05x = 4,694,737,114.28
  5. Step 5: Solve for x
    x = 4,694,737,114.28/78,915.05
  6. Step 6: Final answer
    x = 59,491.02

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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.