Home / 78,380.40-117,570.60-55,110.72

Finding the Fourth Proportional to 78,380.40, 117,570.60 and 55,110.72

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Solution

The fourth proportional to 78,380.40, 117,570.60 and 55,110.72 is: 82,666.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,380.40 : 117,570.60 = 55,110.72 : x
  2. Step 2: Convert to fraction form
    78,380.40/117,570.60 = 55,110.72/x
  3. Step 3: Cross multiply
    78,380.40x = 117,570.60 × 55,110.72
  4. Step 4: Simplify right side
    78,380.40x = 6,479,400,416.83
  5. Step 5: Solve for x
    x = 6,479,400,416.83/78,380.40
  6. Step 6: Final answer
    x = 82,666.08

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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.