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Finding the Fourth Proportional to 498.51, 687.75 and 321.45

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Solution

The fourth proportional to 498.51, 687.75 and 321.45 is: 443.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.51 : 687.75 = 321.45 : x
  2. Step 2: Convert to fraction form
    498.51/687.75 = 321.45/x
  3. Step 3: Cross multiply
    498.51x = 687.75 × 321.45
  4. Step 4: Simplify right side
    498.51x = 221,077.24
  5. Step 5: Solve for x
    x = 221,077.24/498.51
  6. Step 6: Final answer
    x = 443.48

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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.