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Finding the Fourth Proportional to 28,247.68, 38,981.28 and 15,672.16

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Solution

The fourth proportional to 28,247.68, 38,981.28 and 15,672.16 is: 21,627.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,247.68 : 38,981.28 = 15,672.16 : x
  2. Step 2: Convert to fraction form
    28,247.68/38,981.28 = 15,672.16/x
  3. Step 3: Cross multiply
    28,247.68x = 38,981.28 × 15,672.16
  4. Step 4: Simplify right side
    28,247.68x = 610,920,857.16
  5. Step 5: Solve for x
    x = 610,920,857.16/28,247.68
  6. Step 6: Final answer
    x = 21,627.29

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.