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Finding the Fourth Proportional to 39,458, 54,451.72 and 21,553.01

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Solution

The fourth proportional to 39,458, 54,451.72 and 21,553.01 is: 29,742.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,458 : 54,451.72 = 21,553.01 : x
  2. Step 2: Convert to fraction form
    39,458/54,451.72 = 21,553.01/x
  3. Step 3: Cross multiply
    39,458x = 54,451.72 × 21,553.01
  4. Step 4: Simplify right side
    39,458x = 1,173,598,411.79
  5. Step 5: Solve for x
    x = 1,173,598,411.79/39,458
  6. Step 6: Final answer
    x = 29,742.98

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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.