Home / 135,486.96-186,971.40-78,126

Finding the Fourth Proportional to 135,486.96, 186,971.40 and 78,126

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Solution

The fourth proportional to 135,486.96, 186,971.40 and 78,126 is: 107,813.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,486.96 : 186,971.40 = 78,126 : x
  2. Step 2: Convert to fraction form
    135,486.96/186,971.40 = 78,126/x
  3. Step 3: Cross multiply
    135,486.96x = 186,971.40 × 78,126
  4. Step 4: Simplify right side
    135,486.96x = 14,607,327,596.40
  5. Step 5: Solve for x
    x = 14,607,327,596.40/135,486.96
  6. Step 6: Final answer
    x = 107,813.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.