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Finding the Fourth Proportional to 387,431.73, 534,652.26 and 215,345.28

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Solution

The fourth proportional to 387,431.73, 534,652.26 and 215,345.28 is: 297,174.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,431.73 : 534,652.26 = 215,345.28 : x
  2. Step 2: Convert to fraction form
    387,431.73/534,652.26 = 215,345.28/x
  3. Step 3: Cross multiply
    387,431.73x = 534,652.26 × 215,345.28
  4. Step 4: Simplify right side
    387,431.73x = 115,134,840,632.33
  5. Step 5: Solve for x
    x = 115,134,840,632.33/387,431.73
  6. Step 6: Final answer
    x = 297,174.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.