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Finding the Fourth Proportional to 21,243.80, 31,866.90 and 6,453.20

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Solution

The fourth proportional to 21,243.80, 31,866.90 and 6,453.20 is: 9,680.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,243.80 : 31,866.90 = 6,453.20 : x
  2. Step 2: Convert to fraction form
    21,243.80/31,866.90 = 6,453.20/x
  3. Step 3: Cross multiply
    21,243.80x = 31,866.90 × 6,453.20
  4. Step 4: Simplify right side
    21,243.80x = 205,643,479.08
  5. Step 5: Solve for x
    x = 205,643,479.08/21,243.80
  6. Step 6: Final answer
    x = 9,680.16

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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.