Home / 12,780.25-17,636.75-7,191.25

Finding the Fourth Proportional to 12,780.25, 17,636.75 and 7,191.25

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Solution

The fourth proportional to 12,780.25, 17,636.75 and 7,191.25 is: 9,923.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.25 : 17,636.75 = 7,191.25 : x
  2. Step 2: Convert to fraction form
    12,780.25/17,636.75 = 7,191.25/x
  3. Step 3: Cross multiply
    12,780.25x = 17,636.75 × 7,191.25
  4. Step 4: Simplify right side
    12,780.25x = 126,830,278.44
  5. Step 5: Solve for x
    x = 126,830,278.44/12,780.25
  6. Step 6: Final answer
    x = 9,923.93

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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.