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Finding the Fourth Proportional to 28,174.72, 38,881.72 and 15,428.44

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Solution

The fourth proportional to 28,174.72, 38,881.72 and 15,428.44 is: 21,291.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,174.72 : 38,881.72 = 15,428.44 : x
  2. Step 2: Convert to fraction form
    28,174.72/38,881.72 = 15,428.44/x
  3. Step 3: Cross multiply
    28,174.72x = 38,881.72 × 15,428.44
  4. Step 4: Simplify right side
    28,174.72x = 599,884,284.12
  5. Step 5: Solve for x
    x = 599,884,284.12/28,174.72
  6. Step 6: Final answer
    x = 21,291.58

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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.