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Finding the Fourth Proportional to 39,649, 54,710.59 and 21,739.30

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Solution

The fourth proportional to 39,649, 54,710.59 and 21,739.30 is: 29,997.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,649 : 54,710.59 = 21,739.30 : x
  2. Step 2: Convert to fraction form
    39,649/54,710.59 = 21,739.30/x
  3. Step 3: Cross multiply
    39,649x = 54,710.59 × 21,739.30
  4. Step 4: Simplify right side
    39,649x = 1,189,369,929.19
  5. Step 5: Solve for x
    x = 1,189,369,929.19/39,649
  6. Step 6: Final answer
    x = 29,997.48

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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.