Home / 28,528.80-39,369-15,781.65

Finding the Fourth Proportional to 28,528.80, 39,369 and 15,781.65

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Solution

The fourth proportional to 28,528.80, 39,369 and 15,781.65 is: 21,778.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,528.80 : 39,369 = 15,781.65 : x
  2. Step 2: Convert to fraction form
    28,528.80/39,369 = 15,781.65/x
  3. Step 3: Cross multiply
    28,528.80x = 39,369 × 15,781.65
  4. Step 4: Simplify right side
    28,528.80x = 621,307,778.85
  5. Step 5: Solve for x
    x = 621,307,778.85/28,528.80
  6. Step 6: Final answer
    x = 21,778.27

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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.