Home / 21,915.25-30,240.64-13,419.52

Finding the Fourth Proportional to 21,915.25, 30,240.64 and 13,419.52

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Solution

The fourth proportional to 21,915.25, 30,240.64 and 13,419.52 is: 18,517.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.25 : 30,240.64 = 13,419.52 : x
  2. Step 2: Convert to fraction form
    21,915.25/30,240.64 = 13,419.52/x
  3. Step 3: Cross multiply
    21,915.25x = 30,240.64 × 13,419.52
  4. Step 4: Simplify right side
    21,915.25x = 405,814,654.99
  5. Step 5: Solve for x
    x = 405,814,654.99/21,915.25
  6. Step 6: Final answer
    x = 18,517.45

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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.