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Finding the Fourth Proportional to 21,605.20, 32,359.20 and 12,857.20

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Solution

The fourth proportional to 21,605.20, 32,359.20 and 12,857.20 is: 19,256.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.20 : 32,359.20 = 12,857.20 : x
  2. Step 2: Convert to fraction form
    21,605.20/32,359.20 = 12,857.20/x
  3. Step 3: Cross multiply
    21,605.20x = 32,359.20 × 12,857.20
  4. Step 4: Simplify right side
    21,605.20x = 416,048,706.24
  5. Step 5: Solve for x
    x = 416,048,706.24/21,605.20
  6. Step 6: Final answer
    x = 19,256.88

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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.