Home / 12,456.81-17,180.67-7,980.98

Finding the Fourth Proportional to 12,456.81, 17,180.67 and 7,980.98

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Solution

The fourth proportional to 12,456.81, 17,180.67 and 7,980.98 is: 11,007.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456.81 : 17,180.67 = 7,980.98 : x
  2. Step 2: Convert to fraction form
    12,456.81/17,180.67 = 7,980.98/x
  3. Step 3: Cross multiply
    12,456.81x = 17,180.67 × 7,980.98
  4. Step 4: Simplify right side
    12,456.81x = 137,118,497.75
  5. Step 5: Solve for x
    x = 137,118,497.75/12,456.81
  6. Step 6: Final answer
    x = 11,007.52

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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.