Home / 78,105.14-117,133.48-28,178.75

Finding the Fourth Proportional to 78,105.14, 117,133.48 and 28,178.75

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Solution

The fourth proportional to 78,105.14, 117,133.48 and 28,178.75 is: 42,259.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,105.14 : 117,133.48 = 28,178.75 : x
  2. Step 2: Convert to fraction form
    78,105.14/117,133.48 = 28,178.75/x
  3. Step 3: Cross multiply
    78,105.14x = 117,133.48 × 28,178.75
  4. Step 4: Simplify right side
    78,105.14x = 3,300,674,393.44
  5. Step 5: Solve for x
    x = 3,300,674,393.44/78,105.14
  6. Step 6: Final answer
    x = 42,259.38

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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.