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Finding the Fourth Proportional to 21,623.40, 32,443.20 and 8,485.20

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Solution

The fourth proportional to 21,623.40, 32,443.20 and 8,485.20 is: 12,730.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,623.40 : 32,443.20 = 8,485.20 : x
  2. Step 2: Convert to fraction form
    21,623.40/32,443.20 = 8,485.20/x
  3. Step 3: Cross multiply
    21,623.40x = 32,443.20 × 8,485.20
  4. Step 4: Simplify right side
    21,623.40x = 275,287,040.64
  5. Step 5: Solve for x
    x = 275,287,040.64/21,623.40
  6. Step 6: Final answer
    x = 12,730.98

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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.