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Finding the Fourth Proportional to 172,749.60, 258,980.40 and 72,986.40

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Solution

The fourth proportional to 172,749.60, 258,980.40 and 72,986.40 is: 109,418.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,749.60 : 258,980.40 = 72,986.40 : x
  2. Step 2: Convert to fraction form
    172,749.60/258,980.40 = 72,986.40/x
  3. Step 3: Cross multiply
    172,749.60x = 258,980.40 × 72,986.40
  4. Step 4: Simplify right side
    172,749.60x = 18,902,047,066.56
  5. Step 5: Solve for x
    x = 18,902,047,066.56/172,749.60
  6. Step 6: Final answer
    x = 109,418.76

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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.