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Finding the Fourth Proportional to 638,139, 880,637.60 and 351,669.36

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Solution

The fourth proportional to 638,139, 880,637.60 and 351,669.36 is: 485,306.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139 : 880,637.60 = 351,669.36 : x
  2. Step 2: Convert to fraction form
    638,139/880,637.60 = 351,669.36/x
  3. Step 3: Cross multiply
    638,139x = 880,637.60 × 351,669.36
  4. Step 4: Simplify right side
    638,139x = 309,693,261,183.94
  5. Step 5: Solve for x
    x = 309,693,261,183.94/638,139
  6. Step 6: Final answer
    x = 485,306.90

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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.