Home / 21,012.50-31,497.48-13,621.65

Finding the Fourth Proportional to 21,012.50, 31,497.48 and 13,621.65

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Solution

The fourth proportional to 21,012.50, 31,497.48 and 13,621.65 is: 20,418.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.50 : 31,497.48 = 13,621.65 : x
  2. Step 2: Convert to fraction form
    21,012.50/31,497.48 = 13,621.65/x
  3. Step 3: Cross multiply
    21,012.50x = 31,497.48 × 13,621.65
  4. Step 4: Simplify right side
    21,012.50x = 429,047,648.44
  5. Step 5: Solve for x
    x = 429,047,648.44/21,012.50
  6. Step 6: Final answer
    x = 20,418.69

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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.