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Finding the Fourth Proportional to 172,487.34, 258,731.01 and 78,714.54

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Solution

The fourth proportional to 172,487.34, 258,731.01 and 78,714.54 is: 118,071.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,487.34 : 258,731.01 = 78,714.54 : x
  2. Step 2: Convert to fraction form
    172,487.34/258,731.01 = 78,714.54/x
  3. Step 3: Cross multiply
    172,487.34x = 258,731.01 × 78,714.54
  4. Step 4: Simplify right side
    172,487.34x = 20,365,892,435.89
  5. Step 5: Solve for x
    x = 20,365,892,435.89/172,487.34
  6. Step 6: Final answer
    x = 118,071.81

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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.