Home / 20,981.64-28,954.86-11,550.39

Finding the Fourth Proportional to 20,981.64, 28,954.86 and 11,550.39

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Solution

The fourth proportional to 20,981.64, 28,954.86 and 11,550.39 is: 15,939.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.64 : 28,954.86 = 11,550.39 : x
  2. Step 2: Convert to fraction form
    20,981.64/28,954.86 = 11,550.39/x
  3. Step 3: Cross multiply
    20,981.64x = 28,954.86 × 11,550.39
  4. Step 4: Simplify right side
    20,981.64x = 334,439,925.40
  5. Step 5: Solve for x
    x = 334,439,925.40/20,981.64
  6. Step 6: Final answer
    x = 15,939.65

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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.