Home / 20,988.30-31,509.18-18,045.57

Finding the Fourth Proportional to 20,988.30, 31,509.18 and 18,045.57

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Solution

The fourth proportional to 20,988.30, 31,509.18 and 18,045.57 is: 27,091.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.30 : 31,509.18 = 18,045.57 : x
  2. Step 2: Convert to fraction form
    20,988.30/31,509.18 = 18,045.57/x
  3. Step 3: Cross multiply
    20,988.30x = 31,509.18 × 18,045.57
  4. Step 4: Simplify right side
    20,988.30x = 568,601,113.33
  5. Step 5: Solve for x
    x = 568,601,113.33/20,988.30
  6. Step 6: Final answer
    x = 27,091.34

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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.