Home / 20,915.28-31,188.42-18,012.24

Finding the Fourth Proportional to 20,915.28, 31,188.42 and 18,012.24

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Solution

The fourth proportional to 20,915.28, 31,188.42 and 18,012.24 is: 26,859.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.28 : 31,188.42 = 18,012.24 : x
  2. Step 2: Convert to fraction form
    20,915.28/31,188.42 = 18,012.24/x
  3. Step 3: Cross multiply
    20,915.28x = 31,188.42 × 18,012.24
  4. Step 4: Simplify right side
    20,915.28x = 561,773,306.26
  5. Step 5: Solve for x
    x = 561,773,306.26/20,915.28
  6. Step 6: Final answer
    x = 26,859.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.