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Finding the Fourth Proportional to 39,381.95, 54,346.95 and 21,476.80

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Solution

The fourth proportional to 39,381.95, 54,346.95 and 21,476.80 is: 29,637.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,381.95 : 54,346.95 = 21,476.80 : x
  2. Step 2: Convert to fraction form
    39,381.95/54,346.95 = 21,476.80/x
  3. Step 3: Cross multiply
    39,381.95x = 54,346.95 × 21,476.80
  4. Step 4: Simplify right side
    39,381.95x = 1,167,198,337.99
  5. Step 5: Solve for x
    x = 1,167,198,337.99/39,381.95
  6. Step 6: Final answer
    x = 29,637.90

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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.