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Finding the Fourth Proportional to 38,720.95, 53,435.49 and 21,728.90

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Solution

The fourth proportional to 38,720.95, 53,435.49 and 21,728.90 is: 29,986.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,720.95 : 53,435.49 = 21,728.90 : x
  2. Step 2: Convert to fraction form
    38,720.95/53,435.49 = 21,728.90/x
  3. Step 3: Cross multiply
    38,720.95x = 53,435.49 × 21,728.90
  4. Step 4: Simplify right side
    38,720.95x = 1,161,094,418.66
  5. Step 5: Solve for x
    x = 1,161,094,418.66/38,720.95
  6. Step 6: Final answer
    x = 29,986.21

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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.