Home / 28,710.72-39,640.32-21,157.92

Finding the Fourth Proportional to 28,710.72, 39,640.32 and 21,157.92

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Solution

The fourth proportional to 28,710.72, 39,640.32 and 21,157.92 is: 29,212.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,710.72 : 39,640.32 = 21,157.92 : x
  2. Step 2: Convert to fraction form
    28,710.72/39,640.32 = 21,157.92/x
  3. Step 3: Cross multiply
    28,710.72x = 39,640.32 × 21,157.92
  4. Step 4: Simplify right side
    28,710.72x = 838,706,719.33
  5. Step 5: Solve for x
    x = 838,706,719.33/28,710.72
  6. Step 6: Final answer
    x = 29,212.32

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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.