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Finding the Fourth Proportional to 72,471.78, 99,895.36 and 57,133.31

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Solution

The fourth proportional to 72,471.78, 99,895.36 and 57,133.31 is: 78,752.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,471.78 : 99,895.36 = 57,133.31 : x
  2. Step 2: Convert to fraction form
    72,471.78/99,895.36 = 57,133.31/x
  3. Step 3: Cross multiply
    72,471.78x = 99,895.36 × 57,133.31
  4. Step 4: Simplify right side
    72,471.78x = 5,707,352,570.44
  5. Step 5: Solve for x
    x = 5,707,352,570.44/72,471.78
  6. Step 6: Final answer
    x = 78,752.76

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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.