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Finding the Fourth Proportional to 638,135.76, 880,585.70 and 351,655.78

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Solution

The fourth proportional to 638,135.76, 880,585.70 and 351,655.78 is: 485,262.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,135.76 : 880,585.70 = 351,655.78 : x
  2. Step 2: Convert to fraction form
    638,135.76/880,585.70 = 351,655.78/x
  3. Step 3: Cross multiply
    638,135.76x = 880,585.70 × 351,655.78
  4. Step 4: Simplify right side
    638,135.76x = 309,663,051,190.35
  5. Step 5: Solve for x
    x = 309,663,051,190.35/638,135.76
  6. Step 6: Final answer
    x = 485,262.03

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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.