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Finding the Fourth Proportional to 491,018.76, 674,669.34 and 390,241.80

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Solution

The fourth proportional to 491,018.76, 674,669.34 and 390,241.80 is: 536,199.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,018.76 : 674,669.34 = 390,241.80 : x
  2. Step 2: Convert to fraction form
    491,018.76/674,669.34 = 390,241.80/x
  3. Step 3: Cross multiply
    491,018.76x = 674,669.34 × 390,241.80
  4. Step 4: Simplify right side
    491,018.76x = 263,284,177,646.41
  5. Step 5: Solve for x
    x = 263,284,177,646.41/491,018.76
  6. Step 6: Final answer
    x = 536,199.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.