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Finding the Fourth Proportional to 976.64, 1,464.32 and 399.36

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Solution

The fourth proportional to 976.64, 1,464.32 and 399.36 is: 598.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.64 : 1,464.32 = 399.36 : x
  2. Step 2: Convert to fraction form
    976.64/1,464.32 = 399.36/x
  3. Step 3: Cross multiply
    976.64x = 1,464.32 × 399.36
  4. Step 4: Simplify right side
    976.64x = 584,790.84
  5. Step 5: Solve for x
    x = 584,790.84/976.64
  6. Step 6: Final answer
    x = 598.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.