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Finding the Fourth Proportional to 21,685.25, 29,925.65 and 11,749.25

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Solution

The fourth proportional to 21,685.25, 29,925.65 and 11,749.25 is: 16,213.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,685.25 : 29,925.65 = 11,749.25 : x
  2. Step 2: Convert to fraction form
    21,685.25/29,925.65 = 11,749.25/x
  3. Step 3: Cross multiply
    21,685.25x = 29,925.65 × 11,749.25
  4. Step 4: Simplify right side
    21,685.25x = 351,603,943.26
  5. Step 5: Solve for x
    x = 351,603,943.26/21,685.25
  6. Step 6: Final answer
    x = 16,213.97

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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.