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Finding the Fourth Proportional to 76,506.56, 113,990.88 and 72,209.28

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Solution

The fourth proportional to 76,506.56, 113,990.88 and 72,209.28 is: 107,588.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,506.56 : 113,990.88 = 72,209.28 : x
  2. Step 2: Convert to fraction form
    76,506.56/113,990.88 = 72,209.28/x
  3. Step 3: Cross multiply
    76,506.56x = 113,990.88 × 72,209.28
  4. Step 4: Simplify right side
    76,506.56x = 8,231,199,371.37
  5. Step 5: Solve for x
    x = 8,231,199,371.37/76,506.56
  6. Step 6: Final answer
    x = 107,588.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.