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Finding the Fourth Proportional to 497.99, 687.21 and 301.40

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Solution

The fourth proportional to 497.99, 687.21 and 301.40 is: 415.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.99 : 687.21 = 301.40 : x
  2. Step 2: Convert to fraction form
    497.99/687.21 = 301.40/x
  3. Step 3: Cross multiply
    497.99x = 687.21 × 301.40
  4. Step 4: Simplify right side
    497.99x = 207,125.09
  5. Step 5: Solve for x
    x = 207,125.09/497.99
  6. Step 6: Final answer
    x = 415.92

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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.