Home / 21,006.72-28,989.12-11,575.20

Finding the Fourth Proportional to 21,006.72, 28,989.12 and 11,575.20

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Solution

The fourth proportional to 21,006.72, 28,989.12 and 11,575.20 is: 15,973.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.72 : 28,989.12 = 11,575.20 : x
  2. Step 2: Convert to fraction form
    21,006.72/28,989.12 = 11,575.20/x
  3. Step 3: Cross multiply
    21,006.72x = 28,989.12 × 11,575.20
  4. Step 4: Simplify right side
    21,006.72x = 335,554,861.82
  5. Step 5: Solve for x
    x = 335,554,861.82/21,006.72
  6. Step 6: Final answer
    x = 15,973.69

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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.