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Finding the Fourth Proportional to 28,900.72, 39,915.90 and 19,452.88

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Solution

The fourth proportional to 28,900.72, 39,915.90 and 19,452.88 is: 26,867.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,900.72 : 39,915.90 = 19,452.88 : x
  2. Step 2: Convert to fraction form
    28,900.72/39,915.90 = 19,452.88/x
  3. Step 3: Cross multiply
    28,900.72x = 39,915.90 × 19,452.88
  4. Step 4: Simplify right side
    28,900.72x = 776,479,212.79
  5. Step 5: Solve for x
    x = 776,479,212.79/28,900.72
  6. Step 6: Final answer
    x = 26,867.12

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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.