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Finding the Fourth Proportional to 28,931.20, 43,399.20 and 9,209.20

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Solution

The fourth proportional to 28,931.20, 43,399.20 and 9,209.20 is: 13,814.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,931.20 : 43,399.20 = 9,209.20 : x
  2. Step 2: Convert to fraction form
    28,931.20/43,399.20 = 9,209.20/x
  3. Step 3: Cross multiply
    28,931.20x = 43,399.20 × 9,209.20
  4. Step 4: Simplify right side
    28,931.20x = 399,671,912.64
  5. Step 5: Solve for x
    x = 399,671,912.64/28,931.20
  6. Step 6: Final answer
    x = 13,814.56

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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.