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Finding the Fourth Proportional to 39,722.51, 54,817.51 and 21,817.93

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Solution

The fourth proportional to 39,722.51, 54,817.51 and 21,817.93 is: 30,108.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,722.51 : 54,817.51 = 21,817.93 : x
  2. Step 2: Convert to fraction form
    39,722.51/54,817.51 = 21,817.93/x
  3. Step 3: Cross multiply
    39,722.51x = 54,817.51 × 21,817.93
  4. Step 4: Simplify right side
    39,722.51x = 1,196,004,595.95
  5. Step 5: Solve for x
    x = 1,196,004,595.95/39,722.51
  6. Step 6: Final answer
    x = 30,108.99

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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.