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Finding the Fourth Proportional to 15,274.78, 21,078.84 and 8,987.56

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Solution

The fourth proportional to 15,274.78, 21,078.84 and 8,987.56 is: 12,402.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,274.78 : 21,078.84 = 8,987.56 : x
  2. Step 2: Convert to fraction form
    15,274.78/21,078.84 = 8,987.56/x
  3. Step 3: Cross multiply
    15,274.78x = 21,078.84 × 8,987.56
  4. Step 4: Simplify right side
    15,274.78x = 189,447,339.23
  5. Step 5: Solve for x
    x = 189,447,339.23/15,274.78
  6. Step 6: Final answer
    x = 12,402.62

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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.