Home / 21,020.49-31,499.01-12,691.26

Finding the Fourth Proportional to 21,020.49, 31,499.01 and 12,691.26

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Solution

The fourth proportional to 21,020.49, 31,499.01 and 12,691.26 is: 19,017.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.49 : 31,499.01 = 12,691.26 : x
  2. Step 2: Convert to fraction form
    21,020.49/31,499.01 = 12,691.26/x
  3. Step 3: Cross multiply
    21,020.49x = 31,499.01 × 12,691.26
  4. Step 4: Simplify right side
    21,020.49x = 399,762,125.65
  5. Step 5: Solve for x
    x = 399,762,125.65/21,020.49
  6. Step 6: Final answer
    x = 19,017.74

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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.