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Finding the Fourth Proportional to 39,363.90, 54,321.82 and 21,458.90

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Solution

The fourth proportional to 39,363.90, 54,321.82 and 21,458.90 is: 29,613.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,363.90 : 54,321.82 = 21,458.90 : x
  2. Step 2: Convert to fraction form
    39,363.90/54,321.82 = 21,458.90/x
  3. Step 3: Cross multiply
    39,363.90x = 54,321.82 × 21,458.90
  4. Step 4: Simplify right side
    39,363.90x = 1,165,686,503.20
  5. Step 5: Solve for x
    x = 1,165,686,503.20/39,363.90
  6. Step 6: Final answer
    x = 29,613.08

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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.