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Finding the Fourth Proportional to 641,883.28, 885,829.36 and 387,229

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Solution

The fourth proportional to 641,883.28, 885,829.36 and 387,229 is: 534,394.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,883.28 : 885,829.36 = 387,229 : x
  2. Step 2: Convert to fraction form
    641,883.28/885,829.36 = 387,229/x
  3. Step 3: Cross multiply
    641,883.28x = 885,829.36 × 387,229
  4. Step 4: Simplify right side
    641,883.28x = 343,018,817,243.44
  5. Step 5: Solve for x
    x = 343,018,817,243.44/641,883.28
  6. Step 6: Final answer
    x = 534,394.38

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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.