Home / 20,431-28,176.06-13,253.44

Finding the Fourth Proportional to 20,431, 28,176.06 and 13,253.44

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Solution

The fourth proportional to 20,431, 28,176.06 and 13,253.44 is: 18,277.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431 : 28,176.06 = 13,253.44 : x
  2. Step 2: Convert to fraction form
    20,431/28,176.06 = 13,253.44/x
  3. Step 3: Cross multiply
    20,431x = 28,176.06 × 13,253.44
  4. Step 4: Simplify right side
    20,431x = 373,429,720.65
  5. Step 5: Solve for x
    x = 373,429,720.65/20,431
  6. Step 6: Final answer
    x = 18,277.60

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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.