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Finding the Fourth Proportional to 498.64, 687.94 and 312.06

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Solution

The fourth proportional to 498.64, 687.94 and 312.06 is: 430.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.64 : 687.94 = 312.06 : x
  2. Step 2: Convert to fraction form
    498.64/687.94 = 312.06/x
  3. Step 3: Cross multiply
    498.64x = 687.94 × 312.06
  4. Step 4: Simplify right side
    498.64x = 214,678.56
  5. Step 5: Solve for x
    x = 214,678.56/498.64
  6. Step 6: Final answer
    x = 430.53

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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.