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Finding the Fourth Proportional to 72,758.48, 100,405.98 and 40,492.56

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Solution

The fourth proportional to 72,758.48, 100,405.98 and 40,492.56 is: 55,879.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,758.48 : 100,405.98 = 40,492.56 : x
  2. Step 2: Convert to fraction form
    72,758.48/100,405.98 = 40,492.56/x
  3. Step 3: Cross multiply
    72,758.48x = 100,405.98 × 40,492.56
  4. Step 4: Simplify right side
    72,758.48x = 4,065,695,169.51
  5. Step 5: Solve for x
    x = 4,065,695,169.51/72,758.48
  6. Step 6: Final answer
    x = 55,879.33

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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.