Home / 21,121.13-31,668.33-17,988.86

Finding the Fourth Proportional to 21,121.13, 31,668.33 and 17,988.86

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Solution

The fourth proportional to 21,121.13, 31,668.33 and 17,988.86 is: 26,971.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.13 : 31,668.33 = 17,988.86 : x
  2. Step 2: Convert to fraction form
    21,121.13/31,668.33 = 17,988.86/x
  3. Step 3: Cross multiply
    21,121.13x = 31,668.33 × 17,988.86
  4. Step 4: Simplify right side
    21,121.13x = 569,677,154.80
  5. Step 5: Solve for x
    x = 569,677,154.80/21,121.13
  6. Step 6: Final answer
    x = 26,971.91

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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.