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Finding the Fourth Proportional to 28,018.60, 38,664.42 and 15,442.60

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Solution

The fourth proportional to 28,018.60, 38,664.42 and 15,442.60 is: 21,310.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,018.60 : 38,664.42 = 15,442.60 : x
  2. Step 2: Convert to fraction form
    28,018.60/38,664.42 = 15,442.60/x
  3. Step 3: Cross multiply
    28,018.60x = 38,664.42 × 15,442.60
  4. Step 4: Simplify right side
    28,018.60x = 597,079,172.29
  5. Step 5: Solve for x
    x = 597,079,172.29/28,018.60
  6. Step 6: Final answer
    x = 21,310.10

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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.