Home / 135,291.20-186,656.64-78,690.56

Finding the Fourth Proportional to 135,291.20, 186,656.64 and 78,690.56

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Solution

The fourth proportional to 135,291.20, 186,656.64 and 78,690.56 is: 108,566.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,291.20 : 186,656.64 = 78,690.56 : x
  2. Step 2: Convert to fraction form
    135,291.20/186,656.64 = 78,690.56/x
  3. Step 3: Cross multiply
    135,291.20x = 186,656.64 × 78,690.56
  4. Step 4: Simplify right side
    135,291.20x = 14,688,115,529.32
  5. Step 5: Solve for x
    x = 14,688,115,529.32/135,291.20
  6. Step 6: Final answer
    x = 108,566.67

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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.