Home / 78,921.88-118,382.01-45,620.76

Finding the Fourth Proportional to 78,921.88, 118,382.01 and 45,620.76

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Solution

The fourth proportional to 78,921.88, 118,382.01 and 45,620.76 is: 68,430.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,921.88 : 118,382.01 = 45,620.76 : x
  2. Step 2: Convert to fraction form
    78,921.88/118,382.01 = 45,620.76/x
  3. Step 3: Cross multiply
    78,921.88x = 118,382.01 × 45,620.76
  4. Step 4: Simplify right side
    78,921.88x = 5,400,676,822.60
  5. Step 5: Solve for x
    x = 5,400,676,822.60/78,921.88
  6. Step 6: Final answer
    x = 68,430.67

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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.