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Finding the Fourth Proportional to 68,639.80, 102,959.70 and 61,382.20

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Solution

The fourth proportional to 68,639.80, 102,959.70 and 61,382.20 is: 92,073.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,639.80 : 102,959.70 = 61,382.20 : x
  2. Step 2: Convert to fraction form
    68,639.80/102,959.70 = 61,382.20/x
  3. Step 3: Cross multiply
    68,639.80x = 102,959.70 × 61,382.20
  4. Step 4: Simplify right side
    68,639.80x = 6,319,892,897.34
  5. Step 5: Solve for x
    x = 6,319,892,897.34/68,639.80
  6. Step 6: Final answer
    x = 92,073.30

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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.