Home / 20,855.45-31,287.80-11,490.65

Finding the Fourth Proportional to 20,855.45, 31,287.80 and 11,490.65

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Solution

The fourth proportional to 20,855.45, 31,287.80 and 11,490.65 is: 17,238.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.45 : 31,287.80 = 11,490.65 : x
  2. Step 2: Convert to fraction form
    20,855.45/31,287.80 = 11,490.65/x
  3. Step 3: Cross multiply
    20,855.45x = 31,287.80 × 11,490.65
  4. Step 4: Simplify right side
    20,855.45x = 359,517,159.07
  5. Step 5: Solve for x
    x = 359,517,159.07/20,855.45
  6. Step 6: Final answer
    x = 17,238.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.