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Finding the Fourth Proportional to 172,189.89, 258,384.92 and 72,342.45

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Solution

The fourth proportional to 172,189.89, 258,384.92 and 72,342.45 is: 108,555.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,189.89 : 258,384.92 = 72,342.45 : x
  2. Step 2: Convert to fraction form
    172,189.89/258,384.92 = 72,342.45/x
  3. Step 3: Cross multiply
    172,189.89x = 258,384.92 × 72,342.45
  4. Step 4: Simplify right side
    172,189.89x = 18,692,197,794.14
  5. Step 5: Solve for x
    x = 18,692,197,794.14/172,189.89
  6. Step 6: Final answer
    x = 108,555.72

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1.5x scale

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.