Home / 28,381.72-39,165.12-20,859.64

Finding the Fourth Proportional to 28,381.72, 39,165.12 and 20,859.64

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Solution

The fourth proportional to 28,381.72, 39,165.12 and 20,859.64 is: 28,785.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.72 : 39,165.12 = 20,859.64 : x
  2. Step 2: Convert to fraction form
    28,381.72/39,165.12 = 20,859.64/x
  3. Step 3: Cross multiply
    28,381.72x = 39,165.12 × 20,859.64
  4. Step 4: Simplify right side
    28,381.72x = 816,970,303.76
  5. Step 5: Solve for x
    x = 816,970,303.76/28,381.72
  6. Step 6: Final answer
    x = 28,785.09

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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.