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Finding the Fourth Proportional to 387,428.70, 534,757.14 and 251,454.72

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Solution

The fourth proportional to 387,428.70, 534,757.14 and 251,454.72 is: 347,076.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,428.70 : 534,757.14 = 251,454.72 : x
  2. Step 2: Convert to fraction form
    387,428.70/534,757.14 = 251,454.72/x
  3. Step 3: Cross multiply
    387,428.70x = 534,757.14 × 251,454.72
  4. Step 4: Simplify right side
    387,428.70x = 134,467,206,906.70
  5. Step 5: Solve for x
    x = 134,467,206,906.70/387,428.70
  6. Step 6: Final answer
    x = 347,076.01

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1.5x scale

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.