Home / 20,979.50-28,951.74-11,548.40

Finding the Fourth Proportional to 20,979.50, 28,951.74 and 11,548.40

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Solution

The fourth proportional to 20,979.50, 28,951.74 and 11,548.40 is: 15,936.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.50 : 28,951.74 = 11,548.40 : x
  2. Step 2: Convert to fraction form
    20,979.50/28,951.74 = 11,548.40/x
  3. Step 3: Cross multiply
    20,979.50x = 28,951.74 × 11,548.40
  4. Step 4: Simplify right side
    20,979.50x = 334,346,274.22
  5. Step 5: Solve for x
    x = 334,346,274.22/20,979.50
  6. Step 6: Final answer
    x = 15,936.81

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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.