Home / 21,005.05-28,987.50-11,573.61

Finding the Fourth Proportional to 21,005.05, 28,987.50 and 11,573.61

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Solution

The fourth proportional to 21,005.05, 28,987.50 and 11,573.61 is: 15,971.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.05 : 28,987.50 = 11,573.61 : x
  2. Step 2: Convert to fraction form
    21,005.05/28,987.50 = 11,573.61/x
  3. Step 3: Cross multiply
    21,005.05x = 28,987.50 × 11,573.61
  4. Step 4: Simplify right side
    21,005.05x = 335,490,019.88
  5. Step 5: Solve for x
    x = 335,490,019.88/21,005.05
  6. Step 6: Final answer
    x = 15,971.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.