Home / 21,012.75-31,519.13-5,430.38

Finding the Fourth Proportional to 21,012.75, 31,519.13 and 5,430.38

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Solution

The fourth proportional to 21,012.75, 31,519.13 and 5,430.38 is: 8,145.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.75 : 31,519.13 = 5,430.38 : x
  2. Step 2: Convert to fraction form
    21,012.75/31,519.13 = 5,430.38/x
  3. Step 3: Cross multiply
    21,012.75x = 31,519.13 × 5,430.38
  4. Step 4: Simplify right side
    21,012.75x = 171,160,668.42
  5. Step 5: Solve for x
    x = 171,160,668.42/21,012.75
  6. Step 6: Final answer
    x = 8,145.56

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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.