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Finding the Fourth Proportional to 39,839.79, 54,978.13 and 21,935.09

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Solution

The fourth proportional to 39,839.79, 54,978.13 and 21,935.09 is: 30,270.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,839.79 : 54,978.13 = 21,935.09 : x
  2. Step 2: Convert to fraction form
    39,839.79/54,978.13 = 21,935.09/x
  3. Step 3: Cross multiply
    39,839.79x = 54,978.13 × 21,935.09
  4. Step 4: Simplify right side
    39,839.79x = 1,205,950,312.19
  5. Step 5: Solve for x
    x = 1,205,950,312.19/39,839.79
  6. Step 6: Final answer
    x = 30,270.00

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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.