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Finding the Fourth Proportional to 499.08, 688.58 and 312.60

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Solution

The fourth proportional to 499.08, 688.58 and 312.60 is: 431.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.08 : 688.58 = 312.60 : x
  2. Step 2: Convert to fraction form
    499.08/688.58 = 312.60/x
  3. Step 3: Cross multiply
    499.08x = 688.58 × 312.60
  4. Step 4: Simplify right side
    499.08x = 215,250.11
  5. Step 5: Solve for x
    x = 215,250.11/499.08
  6. Step 6: Final answer
    x = 431.29

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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.