Home / 28,357.78-39,135.27-15,782.80

Finding the Fourth Proportional to 28,357.78, 39,135.27 and 15,782.80

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Solution

The fourth proportional to 28,357.78, 39,135.27 and 15,782.80 is: 21,781.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.78 : 39,135.27 = 15,782.80 : x
  2. Step 2: Convert to fraction form
    28,357.78/39,135.27 = 15,782.80/x
  3. Step 3: Cross multiply
    28,357.78x = 39,135.27 × 15,782.80
  4. Step 4: Simplify right side
    28,357.78x = 617,664,139.36
  5. Step 5: Solve for x
    x = 617,664,139.36/28,357.78
  6. Step 6: Final answer
    x = 21,781.12

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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.