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Finding the Fourth Proportional to 30,412.80, 45,516.80 and 21,196.80

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Solution

The fourth proportional to 30,412.80, 45,516.80 and 21,196.80 is: 31,723.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,412.80 : 45,516.80 = 21,196.80 : x
  2. Step 2: Convert to fraction form
    30,412.80/45,516.80 = 21,196.80/x
  3. Step 3: Cross multiply
    30,412.80x = 45,516.80 × 21,196.80
  4. Step 4: Simplify right side
    30,412.80x = 964,810,506.24
  5. Step 5: Solve for x
    x = 964,810,506.24/30,412.80
  6. Step 6: Final answer
    x = 31,723.83

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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.