Home / 20,381.30-28,114.27-12,815.65

Finding the Fourth Proportional to 20,381.30, 28,114.27 and 12,815.65

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Solution

The fourth proportional to 20,381.30, 28,114.27 and 12,815.65 is: 17,678.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.30 : 28,114.27 = 12,815.65 : x
  2. Step 2: Convert to fraction form
    20,381.30/28,114.27 = 12,815.65/x
  3. Step 3: Cross multiply
    20,381.30x = 28,114.27 × 12,815.65
  4. Step 4: Simplify right side
    20,381.30x = 360,302,644.33
  5. Step 5: Solve for x
    x = 360,302,644.33/20,381.30
  6. Step 6: Final answer
    x = 17,678.10

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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.