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Finding the Fourth Proportional to 68,718.60, 103,077.90 and 61,331.40

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Solution

The fourth proportional to 68,718.60, 103,077.90 and 61,331.40 is: 91,997.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,718.60 : 103,077.90 = 61,331.40 : x
  2. Step 2: Convert to fraction form
    68,718.60/103,077.90 = 61,331.40/x
  3. Step 3: Cross multiply
    68,718.60x = 103,077.90 × 61,331.40
  4. Step 4: Simplify right side
    68,718.60x = 6,321,911,916.06
  5. Step 5: Solve for x
    x = 6,321,911,916.06/68,718.60
  6. Step 6: Final answer
    x = 91,997.10

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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.