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Finding the Fourth Proportional to 21,125.60, 31,676.60 and 8,654.32

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Solution

The fourth proportional to 21,125.60, 31,676.60 and 8,654.32 is: 12,976.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125.60 : 31,676.60 = 8,654.32 : x
  2. Step 2: Convert to fraction form
    21,125.60/31,676.60 = 8,654.32/x
  3. Step 3: Cross multiply
    21,125.60x = 31,676.60 × 8,654.32
  4. Step 4: Simplify right side
    21,125.60x = 274,139,432.91
  5. Step 5: Solve for x
    x = 274,139,432.91/21,125.60
  6. Step 6: Final answer
    x = 12,976.65

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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.