Home / 28,357.91-39,134.16-15,782.66

Finding the Fourth Proportional to 28,357.91, 39,134.16 and 15,782.66

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Solution

The fourth proportional to 28,357.91, 39,134.16 and 15,782.66 is: 21,780.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.91 : 39,134.16 = 15,782.66 : x
  2. Step 2: Convert to fraction form
    28,357.91/39,134.16 = 15,782.66/x
  3. Step 3: Cross multiply
    28,357.91x = 39,134.16 × 15,782.66
  4. Step 4: Simplify right side
    28,357.91x = 617,640,945.99
  5. Step 5: Solve for x
    x = 617,640,945.99/28,357.91
  6. Step 6: Final answer
    x = 21,780.20

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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.