Home / 20,950.13-28,911.72-11,390.66

Finding the Fourth Proportional to 20,950.13, 28,911.72 and 11,390.66

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Solution

The fourth proportional to 20,950.13, 28,911.72 and 11,390.66 is: 15,719.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,950.13 : 28,911.72 = 11,390.66 : x
  2. Step 2: Convert to fraction form
    20,950.13/28,911.72 = 11,390.66/x
  3. Step 3: Cross multiply
    20,950.13x = 28,911.72 × 11,390.66
  4. Step 4: Simplify right side
    20,950.13x = 329,323,427.98
  5. Step 5: Solve for x
    x = 329,323,427.98/20,950.13
  6. Step 6: Final answer
    x = 15,719.40

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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.