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Finding the Fourth Proportional to 172,420.55, 258,668.05 and 52,486.88

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Solution

The fourth proportional to 172,420.55, 258,668.05 and 52,486.88 is: 78,741.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,420.55 : 258,668.05 = 52,486.88 : x
  2. Step 2: Convert to fraction form
    172,420.55/258,668.05 = 52,486.88/x
  3. Step 3: Cross multiply
    172,420.55x = 258,668.05 × 52,486.88
  4. Step 4: Simplify right side
    172,420.55x = 13,576,678,900.18
  5. Step 5: Solve for x
    x = 13,576,678,900.18/172,420.55
  6. Step 6: Final answer
    x = 78,741.65

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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.