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Finding the Fourth Proportional to 103,960.60, 155,940.90 and 56,721.40

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Solution

The fourth proportional to 103,960.60, 155,940.90 and 56,721.40 is: 85,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,960.60 : 155,940.90 = 56,721.40 : x
  2. Step 2: Convert to fraction form
    103,960.60/155,940.90 = 56,721.40/x
  3. Step 3: Cross multiply
    103,960.60x = 155,940.90 × 56,721.40
  4. Step 4: Simplify right side
    103,960.60x = 8,845,186,165.26
  5. Step 5: Solve for x
    x = 8,845,186,165.26/103,960.60
  6. Step 6: Final answer
    x = 85,082.10

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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.