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Finding the Fourth Proportional to 21,406.80, 32,112.60 and 6,615.60

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Solution

The fourth proportional to 21,406.80, 32,112.60 and 6,615.60 is: 9,924.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,406.80 : 32,112.60 = 6,615.60 : x
  2. Step 2: Convert to fraction form
    21,406.80/32,112.60 = 6,615.60/x
  3. Step 3: Cross multiply
    21,406.80x = 32,112.60 × 6,615.60
  4. Step 4: Simplify right side
    21,406.80x = 212,444,116.56
  5. Step 5: Solve for x
    x = 212,444,116.56/21,406.80
  6. Step 6: Final answer
    x = 9,924.14

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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.