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Finding the Fourth Proportional to 266,112.80, 398,708.40 and 172,570.40

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Solution

The fourth proportional to 266,112.80, 398,708.40 and 172,570.40 is: 258,556.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,112.80 : 398,708.40 = 172,570.40 : x
  2. Step 2: Convert to fraction form
    266,112.80/398,708.40 = 172,570.40/x
  3. Step 3: Cross multiply
    266,112.80x = 398,708.40 × 172,570.40
  4. Step 4: Simplify right side
    266,112.80x = 68,805,268,071.36
  5. Step 5: Solve for x
    x = 68,805,268,071.36/266,112.80
  6. Step 6: Final answer
    x = 258,556.78

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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.