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Finding the Fourth Proportional to 28,443.60, 42,670.08 and 12,654.09

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Solution

The fourth proportional to 28,443.60, 42,670.08 and 12,654.09 is: 18,983.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,443.60 : 42,670.08 = 12,654.09 : x
  2. Step 2: Convert to fraction form
    28,443.60/42,670.08 = 12,654.09/x
  3. Step 3: Cross multiply
    28,443.60x = 42,670.08 × 12,654.09
  4. Step 4: Simplify right side
    28,443.60x = 539,951,032.63
  5. Step 5: Solve for x
    x = 539,951,032.63/28,443.60
  6. Step 6: Final answer
    x = 18,983.22

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1.5x scale

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.