Home / 21,011.80-28,995.86-11,580.36

Finding the Fourth Proportional to 21,011.80, 28,995.86 and 11,580.36

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Solution

The fourth proportional to 21,011.80, 28,995.86 and 11,580.36 is: 15,980.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.80 : 28,995.86 = 11,580.36 : x
  2. Step 2: Convert to fraction form
    21,011.80/28,995.86 = 11,580.36/x
  3. Step 3: Cross multiply
    21,011.80x = 28,995.86 × 11,580.36
  4. Step 4: Simplify right side
    21,011.80x = 335,782,439.41
  5. Step 5: Solve for x
    x = 335,782,439.41/21,011.80
  6. Step 6: Final answer
    x = 15,980.66

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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.