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Finding the Fourth Proportional to 291,708.76, 437,636.92 and 81,346.72

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Solution

The fourth proportional to 291,708.76, 437,636.92 and 81,346.72 is: 122,040.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,708.76 : 437,636.92 = 81,346.72 : x
  2. Step 2: Convert to fraction form
    291,708.76/437,636.92 = 81,346.72/x
  3. Step 3: Cross multiply
    291,708.76x = 437,636.92 × 81,346.72
  4. Step 4: Simplify right side
    291,708.76x = 35,600,327,992.90
  5. Step 5: Solve for x
    x = 35,600,327,992.90/291,708.76
  6. Step 6: Final answer
    x = 122,040.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.