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Finding the Fourth Proportional to 21,137.70, 31,706.55 and 14,139.30

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Solution

The fourth proportional to 21,137.70, 31,706.55 and 14,139.30 is: 21,208.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.70 : 31,706.55 = 14,139.30 : x
  2. Step 2: Convert to fraction form
    21,137.70/31,706.55 = 14,139.30/x
  3. Step 3: Cross multiply
    21,137.70x = 31,706.55 × 14,139.30
  4. Step 4: Simplify right side
    21,137.70x = 448,308,422.42
  5. Step 5: Solve for x
    x = 448,308,422.42/21,137.70
  6. Step 6: Final answer
    x = 21,208.95

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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.