Home / 13,220.72-18,243.30-7,915.42

Finding the Fourth Proportional to 13,220.72, 18,243.30 and 7,915.42

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Solution

The fourth proportional to 13,220.72, 18,243.30 and 7,915.42 is: 10,922.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,220.72 : 18,243.30 = 7,915.42 : x
  2. Step 2: Convert to fraction form
    13,220.72/18,243.30 = 7,915.42/x
  3. Step 3: Cross multiply
    13,220.72x = 18,243.30 × 7,915.42
  4. Step 4: Simplify right side
    13,220.72x = 144,403,381.69
  5. Step 5: Solve for x
    x = 144,403,381.69/13,220.72
  6. Step 6: Final answer
    x = 10,922.51

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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.