Home / 12,781.80-17,638.39-7,116.77

Finding the Fourth Proportional to 12,781.80, 17,638.39 and 7,116.77

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Solution

The fourth proportional to 12,781.80, 17,638.39 and 7,116.77 is: 9,820.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.80 : 17,638.39 = 7,116.77 : x
  2. Step 2: Convert to fraction form
    12,781.80/17,638.39 = 7,116.77/x
  3. Step 3: Cross multiply
    12,781.80x = 17,638.39 × 7,116.77
  4. Step 4: Simplify right side
    12,781.80x = 125,528,364.80
  5. Step 5: Solve for x
    x = 125,528,364.80/12,781.80
  6. Step 6: Final answer
    x = 9,820.87

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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.