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Finding the Fourth Proportional to 21,257.40, 31,910.40 and 12,946.80

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Solution

The fourth proportional to 21,257.40, 31,910.40 and 12,946.80 is: 19,435.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,257.40 : 31,910.40 = 12,946.80 : x
  2. Step 2: Convert to fraction form
    21,257.40/31,910.40 = 12,946.80/x
  3. Step 3: Cross multiply
    21,257.40x = 31,910.40 × 12,946.80
  4. Step 4: Simplify right side
    21,257.40x = 413,137,566.72
  5. Step 5: Solve for x
    x = 413,137,566.72/21,257.40
  6. Step 6: Final answer
    x = 19,435.00

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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.