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Finding the Fourth Proportional to 119,690.50, 165,050.13 and 78,865.33

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Solution

The fourth proportional to 119,690.50, 165,050.13 and 78,865.33 is: 108,753.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,690.50 : 165,050.13 = 78,865.33 : x
  2. Step 2: Convert to fraction form
    119,690.50/165,050.13 = 78,865.33/x
  3. Step 3: Cross multiply
    119,690.50x = 165,050.13 × 78,865.33
  4. Step 4: Simplify right side
    119,690.50x = 13,016,732,968.99
  5. Step 5: Solve for x
    x = 13,016,732,968.99/119,690.50
  6. Step 6: Final answer
    x = 108,753.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.