Home / 20,950.80-28,911.63-11,390.55

Finding the Fourth Proportional to 20,950.80, 28,911.63 and 11,390.55

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Solution

The fourth proportional to 20,950.80, 28,911.63 and 11,390.55 is: 15,718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,950.80 : 28,911.63 = 11,390.55 : x
  2. Step 2: Convert to fraction form
    20,950.80/28,911.63 = 11,390.55/x
  3. Step 3: Cross multiply
    20,950.80x = 28,911.63 × 11,390.55
  4. Step 4: Simplify right side
    20,950.80x = 329,319,367.10
  5. Step 5: Solve for x
    x = 329,319,367.10/20,950.80
  6. Step 6: Final answer
    x = 15,718.70

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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.