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Finding the Fourth Proportional to 28,381.88, 42,579.44 and 8,660.40

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Solution

The fourth proportional to 28,381.88, 42,579.44 and 8,660.40 is: 12,992.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.88 : 42,579.44 = 8,660.40 : x
  2. Step 2: Convert to fraction form
    28,381.88/42,579.44 = 8,660.40/x
  3. Step 3: Cross multiply
    28,381.88x = 42,579.44 × 8,660.40
  4. Step 4: Simplify right side
    28,381.88x = 368,754,982.18
  5. Step 5: Solve for x
    x = 368,754,982.18/28,381.88
  6. Step 6: Final answer
    x = 12,992.62

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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.