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Finding the Fourth Proportional to 69,991.37, 105,030.60 and 28,438.37

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Solution

The fourth proportional to 69,991.37, 105,030.60 and 28,438.37 is: 42,675.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,991.37 : 105,030.60 = 28,438.37 : x
  2. Step 2: Convert to fraction form
    69,991.37/105,030.60 = 28,438.37/x
  3. Step 3: Cross multiply
    69,991.37x = 105,030.60 × 28,438.37
  4. Step 4: Simplify right side
    69,991.37x = 2,986,899,064.12
  5. Step 5: Solve for x
    x = 2,986,899,064.12/69,991.37
  6. Step 6: Final answer
    x = 42,675.25

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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.