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Finding the Fourth Proportional to 118,245.60, 177,369.84 and 78,518.88

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Solution

The fourth proportional to 118,245.60, 177,369.84 and 78,518.88 is: 117,779.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,245.60 : 177,369.84 = 78,518.88 : x
  2. Step 2: Convert to fraction form
    118,245.60/177,369.84 = 78,518.88/x
  3. Step 3: Cross multiply
    118,245.60x = 177,369.84 × 78,518.88
  4. Step 4: Simplify right side
    118,245.60x = 13,926,881,182.58
  5. Step 5: Solve for x
    x = 13,926,881,182.58/118,245.60
  6. Step 6: Final answer
    x = 117,779.28

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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.