Home / 20,928.65-28,878.26-13,381.65

Finding the Fourth Proportional to 20,928.65, 28,878.26 and 13,381.65

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Solution

The fourth proportional to 20,928.65, 28,878.26 and 13,381.65 is: 18,464.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.65 : 28,878.26 = 13,381.65 : x
  2. Step 2: Convert to fraction form
    20,928.65/28,878.26 = 13,381.65/x
  3. Step 3: Cross multiply
    20,928.65x = 28,878.26 × 13,381.65
  4. Step 4: Simplify right side
    20,928.65x = 386,438,701.02
  5. Step 5: Solve for x
    x = 386,438,701.02/20,928.65
  6. Step 6: Final answer
    x = 18,464.58

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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.