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Finding the Fourth Proportional to 28,240.40, 38,972.04 and 15,493.60

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Solution

The fourth proportional to 28,240.40, 38,972.04 and 15,493.60 is: 21,381.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,240.40 : 38,972.04 = 15,493.60 : x
  2. Step 2: Convert to fraction form
    28,240.40/38,972.04 = 15,493.60/x
  3. Step 3: Cross multiply
    28,240.40x = 38,972.04 × 15,493.60
  4. Step 4: Simplify right side
    28,240.40x = 603,817,198.94
  5. Step 5: Solve for x
    x = 603,817,198.94/28,240.40
  6. Step 6: Final answer
    x = 21,381.33

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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.