Home / 135,805.98-187,421.70-78,464.67

Finding the Fourth Proportional to 135,805.98, 187,421.70 and 78,464.67

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Solution

The fourth proportional to 135,805.98, 187,421.70 and 78,464.67 is: 108,286.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,805.98 : 187,421.70 = 78,464.67 : x
  2. Step 2: Convert to fraction form
    135,805.98/187,421.70 = 78,464.67/x
  3. Step 3: Cross multiply
    135,805.98x = 187,421.70 × 78,464.67
  4. Step 4: Simplify right side
    135,805.98x = 14,705,980,991.39
  5. Step 5: Solve for x
    x = 14,705,980,991.39/135,805.98
  6. Step 6: Final answer
    x = 108,286.69

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1.5x scale

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.