Home / 20,431.50-28,176.75-13,253.94

Finding the Fourth Proportional to 20,431.50, 28,176.75 and 13,253.94

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Solution

The fourth proportional to 20,431.50, 28,176.75 and 13,253.94 is: 18,278.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.50 : 28,176.75 = 13,253.94 : x
  2. Step 2: Convert to fraction form
    20,431.50/28,176.75 = 13,253.94/x
  3. Step 3: Cross multiply
    20,431.50x = 28,176.75 × 13,253.94
  4. Step 4: Simplify right side
    20,431.50x = 373,452,953.90
  5. Step 5: Solve for x
    x = 373,452,953.90/20,431.50
  6. Step 6: Final answer
    x = 18,278.29

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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.