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Finding the Fourth Proportional to 39,159, 54,039 and 21,254.64

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Solution

The fourth proportional to 39,159, 54,039 and 21,254.64 is: 29,331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,159 : 54,039 = 21,254.64 : x
  2. Step 2: Convert to fraction form
    39,159/54,039 = 21,254.64/x
  3. Step 3: Cross multiply
    39,159x = 54,039 × 21,254.64
  4. Step 4: Simplify right side
    39,159x = 1,148,579,490.96
  5. Step 5: Solve for x
    x = 1,148,579,490.96/39,159
  6. Step 6: Final answer
    x = 29,331.18

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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.