Home / 31,138.05-42,926.05-20,509.23

Finding the Fourth Proportional to 31,138.05, 42,926.05 and 20,509.23

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Solution

The fourth proportional to 31,138.05, 42,926.05 and 20,509.23 is: 28,273.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.05 : 42,926.05 = 20,509.23 : x
  2. Step 2: Convert to fraction form
    31,138.05/42,926.05 = 20,509.23/x
  3. Step 3: Cross multiply
    31,138.05x = 42,926.05 × 20,509.23
  4. Step 4: Simplify right side
    31,138.05x = 880,380,232.44
  5. Step 5: Solve for x
    x = 880,380,232.44/31,138.05
  6. Step 6: Final answer
    x = 28,273.45

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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.