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Finding the Fourth Proportional to 31,497.78, 43,485.01 and 20,901.78

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Solution

The fourth proportional to 31,497.78, 43,485.01 and 20,901.78 is: 28,856.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,497.78 : 43,485.01 = 20,901.78 : x
  2. Step 2: Convert to fraction form
    31,497.78/43,485.01 = 20,901.78/x
  3. Step 3: Cross multiply
    31,497.78x = 43,485.01 × 20,901.78
  4. Step 4: Simplify right side
    31,497.78x = 908,914,112.32
  5. Step 5: Solve for x
    x = 908,914,112.32/31,497.78
  6. Step 6: Final answer
    x = 28,856.45

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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.