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Finding the Fourth Proportional to 28,240.66, 38,972.64 and 15,494.50

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Solution

The fourth proportional to 28,240.66, 38,972.64 and 15,494.50 is: 21,382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,240.66 : 38,972.64 = 15,494.50 : x
  2. Step 2: Convert to fraction form
    28,240.66/38,972.64 = 15,494.50/x
  3. Step 3: Cross multiply
    28,240.66x = 38,972.64 × 15,494.50
  4. Step 4: Simplify right side
    28,240.66x = 603,861,570.48
  5. Step 5: Solve for x
    x = 603,861,570.48/28,240.66
  6. Step 6: Final answer
    x = 21,382.70

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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.