Home / 19,915.72-27,431.34-15,307.69

Finding the Fourth Proportional to 19,915.72, 27,431.34 and 15,307.69

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Solution

The fourth proportional to 19,915.72, 27,431.34 and 15,307.69 is: 21,084.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,915.72 : 27,431.34 = 15,307.69 : x
  2. Step 2: Convert to fraction form
    19,915.72/27,431.34 = 15,307.69/x
  3. Step 3: Cross multiply
    19,915.72x = 27,431.34 × 15,307.69
  4. Step 4: Simplify right side
    19,915.72x = 419,910,328.99
  5. Step 5: Solve for x
    x = 419,910,328.99/19,915.72
  6. Step 6: Final answer
    x = 21,084.36

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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.