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Finding the Fourth Proportional to 39,175.20, 54,060.90 and 21,270

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Solution

The fourth proportional to 39,175.20, 54,060.90 and 21,270 is: 29,352.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,175.20 : 54,060.90 = 21,270 : x
  2. Step 2: Convert to fraction form
    39,175.20/54,060.90 = 21,270/x
  3. Step 3: Cross multiply
    39,175.20x = 54,060.90 × 21,270
  4. Step 4: Simplify right side
    39,175.20x = 1,149,875,343
  5. Step 5: Solve for x
    x = 1,149,875,343/39,175.20
  6. Step 6: Final answer
    x = 29,352.12

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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.