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Finding the Fourth Proportional to 687.67, 949.05 and 407.99

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Solution

The fourth proportional to 687.67, 949.05 and 407.99 is: 563.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.67 : 949.05 = 407.99 : x
  2. Step 2: Convert to fraction form
    687.67/949.05 = 407.99/x
  3. Step 3: Cross multiply
    687.67x = 949.05 × 407.99
  4. Step 4: Simplify right side
    687.67x = 387,202.91
  5. Step 5: Solve for x
    x = 387,202.91/687.67
  6. Step 6: Final answer
    x = 563.07

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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.