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Finding the Fourth Proportional to 21,672.80, 32,509.20 and 12,315.68

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Solution

The fourth proportional to 21,672.80, 32,509.20 and 12,315.68 is: 18,473.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,672.80 : 32,509.20 = 12,315.68 : x
  2. Step 2: Convert to fraction form
    21,672.80/32,509.20 = 12,315.68/x
  3. Step 3: Cross multiply
    21,672.80x = 32,509.20 × 12,315.68
  4. Step 4: Simplify right side
    21,672.80x = 400,372,904.26
  5. Step 5: Solve for x
    x = 400,372,904.26/21,672.80
  6. Step 6: Final answer
    x = 18,473.52

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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.