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Finding the Fourth Proportional to 270,645.16, 405,700 and 128,240.28

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Solution

The fourth proportional to 270,645.16, 405,700 and 128,240.28 is: 192,233.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    270,645.16 : 405,700 = 128,240.28 : x
  2. Step 2: Convert to fraction form
    270,645.16/405,700 = 128,240.28/x
  3. Step 3: Cross multiply
    270,645.16x = 405,700 × 128,240.28
  4. Step 4: Simplify right side
    270,645.16x = 52,027,081,596
  5. Step 5: Solve for x
    x = 52,027,081,596/270,645.16
  6. Step 6: Final answer
    x = 192,233.56

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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.