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Finding the Fourth Proportional to 28,398.60, 42,618.06 and 12,829.32

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Solution

The fourth proportional to 28,398.60, 42,618.06 and 12,829.32 is: 19,253.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,398.60 : 42,618.06 = 12,829.32 : x
  2. Step 2: Convert to fraction form
    28,398.60/42,618.06 = 12,829.32/x
  3. Step 3: Cross multiply
    28,398.60x = 42,618.06 × 12,829.32
  4. Step 4: Simplify right side
    28,398.60x = 546,760,729.52
  5. Step 5: Solve for x
    x = 546,760,729.52/28,398.60
  6. Step 6: Final answer
    x = 19,253.09

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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.