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Finding the Fourth Proportional to 72,291.56, 99,739.62 and 40,455.40

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Solution

The fourth proportional to 72,291.56, 99,739.62 and 40,455.40 is: 55,815.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,291.56 : 99,739.62 = 40,455.40 : x
  2. Step 2: Convert to fraction form
    72,291.56/99,739.62 = 40,455.40/x
  3. Step 3: Cross multiply
    72,291.56x = 99,739.62 × 40,455.40
  4. Step 4: Simplify right side
    72,291.56x = 4,035,006,222.95
  5. Step 5: Solve for x
    x = 4,035,006,222.95/72,291.56
  6. Step 6: Final answer
    x = 55,815.73

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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.