Home / 28,021.83-38,669.62-15,275.12

Finding the Fourth Proportional to 28,021.83, 38,669.62 and 15,275.12

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Solution

The fourth proportional to 28,021.83, 38,669.62 and 15,275.12 is: 21,079.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,021.83 : 38,669.62 = 15,275.12 : x
  2. Step 2: Convert to fraction form
    28,021.83/38,669.62 = 15,275.12/x
  3. Step 3: Cross multiply
    28,021.83x = 38,669.62 × 15,275.12
  4. Step 4: Simplify right side
    28,021.83x = 590,683,085.85
  5. Step 5: Solve for x
    x = 590,683,085.85/28,021.83
  6. Step 6: Final answer
    x = 21,079.39

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Double scale
Find fourth proportional to 28,022.83, 38,671 and 15,276.12
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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.