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Finding the Fourth Proportional to 103,639.17, 155,458.74 and 68,570.64

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Solution

The fourth proportional to 103,639.17, 155,458.74 and 68,570.64 is: 102,855.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.17 : 155,458.74 = 68,570.64 : x
  2. Step 2: Convert to fraction form
    103,639.17/155,458.74 = 68,570.64/x
  3. Step 3: Cross multiply
    103,639.17x = 155,458.74 × 68,570.64
  4. Step 4: Simplify right side
    103,639.17x = 10,659,905,295.39
  5. Step 5: Solve for x
    x = 10,659,905,295.39/103,639.17
  6. Step 6: Final answer
    x = 102,855.95

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1.5x scale

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.