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Finding the Fourth Proportional to 69,677.72, 104,506.86 and 28,115

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Solution

The fourth proportional to 69,677.72, 104,506.86 and 28,115 is: 42,168.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,677.72 : 104,506.86 = 28,115 : x
  2. Step 2: Convert to fraction form
    69,677.72/104,506.86 = 28,115/x
  3. Step 3: Cross multiply
    69,677.72x = 104,506.86 × 28,115
  4. Step 4: Simplify right side
    69,677.72x = 2,938,210,368.90
  5. Step 5: Solve for x
    x = 2,938,210,368.90/69,677.72
  6. Step 6: Final answer
    x = 42,168.58

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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.