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Finding the Fourth Proportional to 12,781.62, 17,638.82 and 7,116.62

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Solution

The fourth proportional to 12,781.62, 17,638.82 and 7,116.62 is: 9,821.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.62 : 17,638.82 = 7,116.62 : x
  2. Step 2: Convert to fraction form
    12,781.62/17,638.82 = 7,116.62/x
  3. Step 3: Cross multiply
    12,781.62x = 17,638.82 × 7,116.62
  4. Step 4: Simplify right side
    12,781.62x = 125,528,655.41
  5. Step 5: Solve for x
    x = 125,528,655.41/12,781.62
  6. Step 6: Final answer
    x = 9,821.03

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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.