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Finding the Fourth Proportional to 172,485, 258,728.68 and 65,840.20

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Solution

The fourth proportional to 172,485, 258,728.68 and 65,840.20 is: 98,760.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,485 : 258,728.68 = 65,840.20 : x
  2. Step 2: Convert to fraction form
    172,485/258,728.68 = 65,840.20/x
  3. Step 3: Cross multiply
    172,485x = 258,728.68 × 65,840.20
  4. Step 4: Simplify right side
    172,485x = 17,034,748,036.94
  5. Step 5: Solve for x
    x = 17,034,748,036.94/172,485
  6. Step 6: Final answer
    x = 98,760.75

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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.