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Finding the Fourth Proportional to 39,394.85, 54,362.90 and 21,489.71

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Solution

The fourth proportional to 39,394.85, 54,362.90 and 21,489.71 is: 29,654.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,394.85 : 54,362.90 = 21,489.71 : x
  2. Step 2: Convert to fraction form
    39,394.85/54,362.90 = 21,489.71/x
  3. Step 3: Cross multiply
    39,394.85x = 54,362.90 × 21,489.71
  4. Step 4: Simplify right side
    39,394.85x = 1,168,242,848.31
  5. Step 5: Solve for x
    x = 1,168,242,848.31/39,394.85
  6. Step 6: Final answer
    x = 29,654.71

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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.