Home / 20,855.09-28,780.40-11,423.04

Finding the Fourth Proportional to 20,855.09, 28,780.40 and 11,423.04

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Solution

The fourth proportional to 20,855.09, 28,780.40 and 11,423.04 is: 15,764.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.09 : 28,780.40 = 11,423.04 : x
  2. Step 2: Convert to fraction form
    20,855.09/28,780.40 = 11,423.04/x
  3. Step 3: Cross multiply
    20,855.09x = 28,780.40 × 11,423.04
  4. Step 4: Simplify right side
    20,855.09x = 328,759,603.30
  5. Step 5: Solve for x
    x = 328,759,603.30/20,855.09
  6. Step 6: Final answer
    x = 15,764.00

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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.