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Finding the Fourth Proportional to 39,703.50, 54,791.70 and 21,799.74

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Solution

The fourth proportional to 39,703.50, 54,791.70 and 21,799.74 is: 30,084.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,703.50 : 54,791.70 = 21,799.74 : x
  2. Step 2: Convert to fraction form
    39,703.50/54,791.70 = 21,799.74/x
  3. Step 3: Cross multiply
    39,703.50x = 54,791.70 × 21,799.74
  4. Step 4: Simplify right side
    39,703.50x = 1,194,444,814.16
  5. Step 5: Solve for x
    x = 1,194,444,814.16/39,703.50
  6. Step 6: Final answer
    x = 30,084.12

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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.