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Finding the Fourth Proportional to 76,986.40, 115,496.40 and 43,722.40

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Solution

The fourth proportional to 76,986.40, 115,496.40 and 43,722.40 is: 65,593.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,986.40 : 115,496.40 = 43,722.40 : x
  2. Step 2: Convert to fraction form
    76,986.40/115,496.40 = 43,722.40/x
  3. Step 3: Cross multiply
    76,986.40x = 115,496.40 × 43,722.40
  4. Step 4: Simplify right side
    76,986.40x = 5,049,779,799.36
  5. Step 5: Solve for x
    x = 5,049,779,799.36/76,986.40
  6. Step 6: Final answer
    x = 65,593.14

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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.