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Finding the Fourth Proportional to 72,981.06, 100,713.96 and 39,447.06

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Solution

The fourth proportional to 72,981.06, 100,713.96 and 39,447.06 is: 54,437.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,981.06 : 100,713.96 = 39,447.06 : x
  2. Step 2: Convert to fraction form
    72,981.06/100,713.96 = 39,447.06/x
  3. Step 3: Cross multiply
    72,981.06x = 100,713.96 × 39,447.06
  4. Step 4: Simplify right side
    72,981.06x = 3,972,869,622.96
  5. Step 5: Solve for x
    x = 3,972,869,622.96/72,981.06
  6. Step 6: Final answer
    x = 54,437.00

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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.