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Finding the Fourth Proportional to 39,391, 54,358.66 and 21,486.15

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Solution

The fourth proportional to 39,391, 54,358.66 and 21,486.15 is: 29,650.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,391 : 54,358.66 = 21,486.15 : x
  2. Step 2: Convert to fraction form
    39,391/54,358.66 = 21,486.15/x
  3. Step 3: Cross multiply
    39,391x = 54,358.66 × 21,486.15
  4. Step 4: Simplify right side
    39,391x = 1,167,958,322.56
  5. Step 5: Solve for x
    x = 1,167,958,322.56/39,391
  6. Step 6: Final answer
    x = 29,650.39

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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.