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Finding the Fourth Proportional to 498.69, 688.10 and 312.26

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Solution

The fourth proportional to 498.69, 688.10 and 312.26 is: 430.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.69 : 688.10 = 312.26 : x
  2. Step 2: Convert to fraction form
    498.69/688.10 = 312.26/x
  3. Step 3: Cross multiply
    498.69x = 688.10 × 312.26
  4. Step 4: Simplify right side
    498.69x = 214,861.10
  5. Step 5: Solve for x
    x = 214,861.10/498.69
  6. Step 6: Final answer
    x = 430.85

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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.