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Finding the Fourth Proportional to 498.83, 688.34 and 312.35

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Solution

The fourth proportional to 498.83, 688.34 and 312.35 is: 431.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.83 : 688.34 = 312.35 : x
  2. Step 2: Convert to fraction form
    498.83/688.34 = 312.35/x
  3. Step 3: Cross multiply
    498.83x = 688.34 × 312.35
  4. Step 4: Simplify right side
    498.83x = 214,998.00
  5. Step 5: Solve for x
    x = 214,998.00/498.83
  6. Step 6: Final answer
    x = 431.01

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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.