Home / 28,581.74-39,407.95-21,005

Finding the Fourth Proportional to 28,581.74, 39,407.95 and 21,005

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Solution

The fourth proportional to 28,581.74, 39,407.95 and 21,005 is: 28,961.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,581.74 : 39,407.95 = 21,005 : x
  2. Step 2: Convert to fraction form
    28,581.74/39,407.95 = 21,005/x
  3. Step 3: Cross multiply
    28,581.74x = 39,407.95 × 21,005
  4. Step 4: Simplify right side
    28,581.74x = 827,763,989.75
  5. Step 5: Solve for x
    x = 827,763,989.75/28,581.74
  6. Step 6: Final answer
    x = 28,961.29

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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.