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Finding the Fourth Proportional to 68,639.80, 102,959.70 and 53,068.60

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Solution

The fourth proportional to 68,639.80, 102,959.70 and 53,068.60 is: 79,602.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,639.80 : 102,959.70 = 53,068.60 : x
  2. Step 2: Convert to fraction form
    68,639.80/102,959.70 = 53,068.60/x
  3. Step 3: Cross multiply
    68,639.80x = 102,959.70 × 53,068.60
  4. Step 4: Simplify right side
    68,639.80x = 5,463,927,135.42
  5. Step 5: Solve for x
    x = 5,463,927,135.42/68,639.80
  6. Step 6: Final answer
    x = 79,602.90

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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.