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Finding the Fourth Proportional to 39,330.09, 54,275.09 and 21,425.09

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Solution

The fourth proportional to 39,330.09, 54,275.09 and 21,425.09 is: 29,566.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,330.09 : 54,275.09 = 21,425.09 : x
  2. Step 2: Convert to fraction form
    39,330.09/54,275.09 = 21,425.09/x
  3. Step 3: Cross multiply
    39,330.09x = 54,275.09 × 21,425.09
  4. Step 4: Simplify right side
    39,330.09x = 1,162,848,309.51
  5. Step 5: Solve for x
    x = 1,162,848,309.51/39,330.09
  6. Step 6: Final answer
    x = 29,566.38

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Double scale
Find fourth proportional to 39,331.09, 54,276.46 and 21,426.09
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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.