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Finding the Fourth Proportional to 39,885.85, 55,042.35 and 21,980.85

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Solution

The fourth proportional to 39,885.85, 55,042.35 and 21,980.85 is: 30,333.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,885.85 : 55,042.35 = 21,980.85 : x
  2. Step 2: Convert to fraction form
    39,885.85/55,042.35 = 21,980.85/x
  3. Step 3: Cross multiply
    39,885.85x = 55,042.35 × 21,980.85
  4. Step 4: Simplify right side
    39,885.85x = 1,209,877,529.09
  5. Step 5: Solve for x
    x = 1,209,877,529.09/39,885.85
  6. Step 6: Final answer
    x = 30,333.50

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Similar ratio
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1.5x scale

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.