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Finding the Fourth Proportional to 72,185.63, 99,619.26 and 40,354.52

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Solution

The fourth proportional to 72,185.63, 99,619.26 and 40,354.52 is: 55,690.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,185.63 : 99,619.26 = 40,354.52 : x
  2. Step 2: Convert to fraction form
    72,185.63/99,619.26 = 40,354.52/x
  3. Step 3: Cross multiply
    72,185.63x = 99,619.26 × 40,354.52
  4. Step 4: Simplify right side
    72,185.63x = 4,020,087,420.06
  5. Step 5: Solve for x
    x = 4,020,087,420.06/72,185.63
  6. Step 6: Final answer
    x = 55,690.97

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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.