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Finding the Fourth Proportional to 118,291.20, 177,145.20 and 78,633.60

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Solution

The fourth proportional to 118,291.20, 177,145.20 and 78,633.60 is: 117,756.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,291.20 : 177,145.20 = 78,633.60 : x
  2. Step 2: Convert to fraction form
    118,291.20/177,145.20 = 78,633.60/x
  3. Step 3: Cross multiply
    118,291.20x = 177,145.20 × 78,633.60
  4. Step 4: Simplify right side
    118,291.20x = 13,929,564,798.72
  5. Step 5: Solve for x
    x = 13,929,564,798.72/118,291.20
  6. Step 6: Final answer
    x = 117,756.56

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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.