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Finding the Fourth Proportional to 687.65, 948.53 and 454.85

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Solution

The fourth proportional to 687.65, 948.53 and 454.85 is: 627.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.65 : 948.53 = 454.85 : x
  2. Step 2: Convert to fraction form
    687.65/948.53 = 454.85/x
  3. Step 3: Cross multiply
    687.65x = 948.53 × 454.85
  4. Step 4: Simplify right side
    687.65x = 431,436.60
  5. Step 5: Solve for x
    x = 431,436.60/687.65
  6. Step 6: Final answer
    x = 627.41

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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.