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Finding the Fourth Proportional to 28,398.25, 42,602.84 and 12,815.88

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Solution

The fourth proportional to 28,398.25, 42,602.84 and 12,815.88 is: 19,226.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,398.25 : 42,602.84 = 12,815.88 : x
  2. Step 2: Convert to fraction form
    28,398.25/42,602.84 = 12,815.88/x
  3. Step 3: Cross multiply
    28,398.25x = 42,602.84 × 12,815.88
  4. Step 4: Simplify right side
    28,398.25x = 545,992,885.10
  5. Step 5: Solve for x
    x = 545,992,885.10/28,398.25
  6. Step 6: Final answer
    x = 19,226.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.