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Finding the Fourth Proportional to 28,905.12, 39,881.04 and 18,299.28

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Solution

The fourth proportional to 28,905.12, 39,881.04 and 18,299.28 is: 25,247.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.12 : 39,881.04 = 18,299.28 : x
  2. Step 2: Convert to fraction form
    28,905.12/39,881.04 = 18,299.28/x
  3. Step 3: Cross multiply
    28,905.12x = 39,881.04 × 18,299.28
  4. Step 4: Simplify right side
    28,905.12x = 729,794,317.65
  5. Step 5: Solve for x
    x = 729,794,317.65/28,905.12
  6. Step 6: Final answer
    x = 25,247.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.