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Finding the Fourth Proportional to 119,808.72, 165,283.61 and 78,919.99

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Solution

The fourth proportional to 119,808.72, 165,283.61 and 78,919.99 is: 108,875.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,808.72 : 165,283.61 = 78,919.99 : x
  2. Step 2: Convert to fraction form
    119,808.72/165,283.61 = 78,919.99/x
  3. Step 3: Cross multiply
    119,808.72x = 165,283.61 × 78,919.99
  4. Step 4: Simplify right side
    119,808.72x = 13,044,180,040.55
  5. Step 5: Solve for x
    x = 13,044,180,040.55/119,808.72
  6. Step 6: Final answer
    x = 108,875.05

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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.