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Finding the Fourth Proportional to 103,619.70, 155,429.55 and 81,069.30

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Solution

The fourth proportional to 103,619.70, 155,429.55 and 81,069.30 is: 121,603.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,619.70 : 155,429.55 = 81,069.30 : x
  2. Step 2: Convert to fraction form
    103,619.70/155,429.55 = 81,069.30/x
  3. Step 3: Cross multiply
    103,619.70x = 155,429.55 × 81,069.30
  4. Step 4: Simplify right side
    103,619.70x = 12,600,564,817.82
  5. Step 5: Solve for x
    x = 12,600,564,817.82/103,619.70
  6. Step 6: Final answer
    x = 121,603.95

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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.