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Finding the Fourth Proportional to 468.82, 646.81 and 311.75

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Solution

The fourth proportional to 468.82, 646.81 and 311.75 is: 430.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.82 : 646.81 = 311.75 : x
  2. Step 2: Convert to fraction form
    468.82/646.81 = 311.75/x
  3. Step 3: Cross multiply
    468.82x = 646.81 × 311.75
  4. Step 4: Simplify right side
    468.82x = 201,639.00
  5. Step 5: Solve for x
    x = 201,639.00/468.82
  6. Step 6: Final answer
    x = 430.10

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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.