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Finding the Fourth Proportional to 39,608.56, 54,657.44 and 21,700

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Solution

The fourth proportional to 39,608.56, 54,657.44 and 21,700 is: 29,944.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,608.56 : 54,657.44 = 21,700 : x
  2. Step 2: Convert to fraction form
    39,608.56/54,657.44 = 21,700/x
  3. Step 3: Cross multiply
    39,608.56x = 54,657.44 × 21,700
  4. Step 4: Simplify right side
    39,608.56x = 1,186,066,448
  5. Step 5: Solve for x
    x = 1,186,066,448/39,608.56
  6. Step 6: Final answer
    x = 29,944.70

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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.