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Finding the Fourth Proportional to 68,778.76, 102,702.41 and 54,579.40

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Solution

The fourth proportional to 68,778.76, 102,702.41 and 54,579.40 is: 81,499.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,778.76 : 102,702.41 = 54,579.40 : x
  2. Step 2: Convert to fraction form
    68,778.76/102,702.41 = 54,579.40/x
  3. Step 3: Cross multiply
    68,778.76x = 102,702.41 × 54,579.40
  4. Step 4: Simplify right side
    68,778.76x = 5,605,435,916.35
  5. Step 5: Solve for x
    x = 5,605,435,916.35/68,778.76
  6. Step 6: Final answer
    x = 81,499.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.