Home / 20,855.90-28,758.08-13,290.25

Finding the Fourth Proportional to 20,855.90, 28,758.08 and 13,290.25

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Solution

The fourth proportional to 20,855.90, 28,758.08 and 13,290.25 is: 18,325.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.90 : 28,758.08 = 13,290.25 : x
  2. Step 2: Convert to fraction form
    20,855.90/28,758.08 = 13,290.25/x
  3. Step 3: Cross multiply
    20,855.90x = 28,758.08 × 13,290.25
  4. Step 4: Simplify right side
    20,855.90x = 382,202,038.19
  5. Step 5: Solve for x
    x = 382,202,038.19/20,855.90
  6. Step 6: Final answer
    x = 18,325.85

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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.