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Finding the Fourth Proportional to 39,781.60, 59,680.40 and 11,701.60

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Solution

The fourth proportional to 39,781.60, 59,680.40 and 11,701.60 is: 17,554.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.60 : 59,680.40 = 11,701.60 : x
  2. Step 2: Convert to fraction form
    39,781.60/59,680.40 = 11,701.60/x
  3. Step 3: Cross multiply
    39,781.60x = 59,680.40 × 11,701.60
  4. Step 4: Simplify right side
    39,781.60x = 698,356,168.64
  5. Step 5: Solve for x
    x = 698,356,168.64/39,781.60
  6. Step 6: Final answer
    x = 17,554.75

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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.