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Finding the Fourth Proportional to 21,706.80, 32,560.20 and 12,958.80

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Solution

The fourth proportional to 21,706.80, 32,560.20 and 12,958.80 is: 19,438.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,706.80 : 32,560.20 = 12,958.80 : x
  2. Step 2: Convert to fraction form
    21,706.80/32,560.20 = 12,958.80/x
  3. Step 3: Cross multiply
    21,706.80x = 32,560.20 × 12,958.80
  4. Step 4: Simplify right side
    21,706.80x = 421,941,119.76
  5. Step 5: Solve for x
    x = 421,941,119.76/21,706.80
  6. Step 6: Final answer
    x = 19,438.20

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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.