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Finding the Fourth Proportional to 78,814.55, 118,221.83 and 78,814.55

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Solution

The fourth proportional to 78,814.55, 118,221.83 and 78,814.55 is: 118,221.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,814.55 : 118,221.83 = 78,814.55 : x
  2. Step 2: Convert to fraction form
    78,814.55/118,221.83 = 78,814.55/x
  3. Step 3: Cross multiply
    78,814.55x = 118,221.83 × 78,814.55
  4. Step 4: Simplify right side
    78,814.55x = 9,317,600,331.63
  5. Step 5: Solve for x
    x = 9,317,600,331.63/78,814.55
  6. Step 6: Final answer
    x = 118,221.83

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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.