Home / 28,377.16-39,142.74-20,406.76

Finding the Fourth Proportional to 28,377.16, 39,142.74 and 20,406.76

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Solution

The fourth proportional to 28,377.16, 39,142.74 and 20,406.76 is: 28,148.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,377.16 : 39,142.74 = 20,406.76 : x
  2. Step 2: Convert to fraction form
    28,377.16/39,142.74 = 20,406.76/x
  3. Step 3: Cross multiply
    28,377.16x = 39,142.74 × 20,406.76
  4. Step 4: Simplify right side
    28,377.16x = 798,776,500.92
  5. Step 5: Solve for x
    x = 798,776,500.92/28,377.16
  6. Step 6: Final answer
    x = 28,148.57

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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.