Home / 31,054.19-42,815.39-20,975.76

Finding the Fourth Proportional to 31,054.19, 42,815.39 and 20,975.76

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Solution

The fourth proportional to 31,054.19, 42,815.39 and 20,975.76 is: 28,919.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,054.19 : 42,815.39 = 20,975.76 : x
  2. Step 2: Convert to fraction form
    31,054.19/42,815.39 = 20,975.76/x
  3. Step 3: Cross multiply
    31,054.19x = 42,815.39 × 20,975.76
  4. Step 4: Simplify right side
    31,054.19x = 898,085,240.07
  5. Step 5: Solve for x
    x = 898,085,240.07/31,054.19
  6. Step 6: Final answer
    x = 28,919.94

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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.