Home / 21,120.13-31,666.83-17,987.86

Finding the Fourth Proportional to 21,120.13, 31,666.83 and 17,987.86

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Solution

The fourth proportional to 21,120.13, 31,666.83 and 17,987.86 is: 26,970.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.13 : 31,666.83 = 17,987.86 : x
  2. Step 2: Convert to fraction form
    21,120.13/31,666.83 = 17,987.86/x
  3. Step 3: Cross multiply
    21,120.13x = 31,666.83 × 17,987.86
  4. Step 4: Simplify right side
    21,120.13x = 569,618,504.68
  5. Step 5: Solve for x
    x = 569,618,504.68/21,120.13
  6. Step 6: Final answer
    x = 26,970.41

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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.