Home / 28,360.28-39,138.72-15,785.30

Finding the Fourth Proportional to 28,360.28, 39,138.72 and 15,785.30

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Solution

The fourth proportional to 28,360.28, 39,138.72 and 15,785.30 is: 21,784.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,360.28 : 39,138.72 = 15,785.30 : x
  2. Step 2: Convert to fraction form
    28,360.28/39,138.72 = 15,785.30/x
  3. Step 3: Cross multiply
    28,360.28x = 39,138.72 × 15,785.30
  4. Step 4: Simplify right side
    28,360.28x = 617,816,436.82
  5. Step 5: Solve for x
    x = 617,816,436.82/28,360.28
  6. Step 6: Final answer
    x = 21,784.57

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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.