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Finding the Fourth Proportional to 103,960.40, 155,940.60 and 56,721.20

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Solution

The fourth proportional to 103,960.40, 155,940.60 and 56,721.20 is: 85,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,960.40 : 155,940.60 = 56,721.20 : x
  2. Step 2: Convert to fraction form
    103,960.40/155,940.60 = 56,721.20/x
  3. Step 3: Cross multiply
    103,960.40x = 155,940.60 × 56,721.20
  4. Step 4: Simplify right side
    103,960.40x = 8,845,137,960.72
  5. Step 5: Solve for x
    x = 8,845,137,960.72/103,960.40
  6. Step 6: Final answer
    x = 85,081.80

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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.