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Finding the Fourth Proportional to 21,000.56, 31,500.15 and 8,520.27

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Solution

The fourth proportional to 21,000.56, 31,500.15 and 8,520.27 is: 12,780.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.56 : 31,500.15 = 8,520.27 : x
  2. Step 2: Convert to fraction form
    21,000.56/31,500.15 = 8,520.27/x
  3. Step 3: Cross multiply
    21,000.56x = 31,500.15 × 8,520.27
  4. Step 4: Simplify right side
    21,000.56x = 268,389,783.04
  5. Step 5: Solve for x
    x = 268,389,783.04/21,000.56
  6. Step 6: Final answer
    x = 12,780.13

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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.