Home / 21,315.87-31,915.74-15,398.82

Finding the Fourth Proportional to 21,315.87, 31,915.74 and 15,398.82

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Solution

The fourth proportional to 21,315.87, 31,915.74 and 15,398.82 is: 23,056.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.87 : 31,915.74 = 15,398.82 : x
  2. Step 2: Convert to fraction form
    21,315.87/31,915.74 = 15,398.82/x
  3. Step 3: Cross multiply
    21,315.87x = 31,915.74 × 15,398.82
  4. Step 4: Simplify right side
    21,315.87x = 491,464,735.43
  5. Step 5: Solve for x
    x = 491,464,735.43/21,315.87
  6. Step 6: Final answer
    x = 23,056.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.