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Finding the Fourth Proportional to 21,604.80, 32,342.40 and 12,835.20

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Solution

The fourth proportional to 21,604.80, 32,342.40 and 12,835.20 is: 19,214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,604.80 : 32,342.40 = 12,835.20 : x
  2. Step 2: Convert to fraction form
    21,604.80/32,342.40 = 12,835.20/x
  3. Step 3: Cross multiply
    21,604.80x = 32,342.40 × 12,835.20
  4. Step 4: Simplify right side
    21,604.80x = 415,121,172.48
  5. Step 5: Solve for x
    x = 415,121,172.48/21,604.80
  6. Step 6: Final answer
    x = 19,214.30

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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.