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Finding the Fourth Proportional to 103,688.58, 155,511.60 and 28,789.90

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Solution

The fourth proportional to 103,688.58, 155,511.60 and 28,789.90 is: 43,178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,688.58 : 155,511.60 = 28,789.90 : x
  2. Step 2: Convert to fraction form
    103,688.58/155,511.60 = 28,789.90/x
  3. Step 3: Cross multiply
    103,688.58x = 155,511.60 × 28,789.90
  4. Step 4: Simplify right side
    103,688.58x = 4,477,163,412.84
  5. Step 5: Solve for x
    x = 4,477,163,412.84/103,688.58
  6. Step 6: Final answer
    x = 43,178.94

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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.