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Finding the Fourth Proportional to 28,493, 39,325.20 and 15,915.32

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Solution

The fourth proportional to 28,493, 39,325.20 and 15,915.32 is: 21,965.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,493 : 39,325.20 = 15,915.32 : x
  2. Step 2: Convert to fraction form
    28,493/39,325.20 = 15,915.32/x
  3. Step 3: Cross multiply
    28,493x = 39,325.20 × 15,915.32
  4. Step 4: Simplify right side
    28,493x = 625,873,142.06
  5. Step 5: Solve for x
    x = 625,873,142.06/28,493
  6. Step 6: Final answer
    x = 21,965.86

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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.