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Finding the Fourth Proportional to 21,000.80, 31,501.20 and 12,706.40

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Solution

The fourth proportional to 21,000.80, 31,501.20 and 12,706.40 is: 19,059.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.80 : 31,501.20 = 12,706.40 : x
  2. Step 2: Convert to fraction form
    21,000.80/31,501.20 = 12,706.40/x
  3. Step 3: Cross multiply
    21,000.80x = 31,501.20 × 12,706.40
  4. Step 4: Simplify right side
    21,000.80x = 400,266,847.68
  5. Step 5: Solve for x
    x = 400,266,847.68/21,000.80
  6. Step 6: Final answer
    x = 19,059.60

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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.