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Finding the Fourth Proportional to 976.72, 1,465.08 and 399.20

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Solution

The fourth proportional to 976.72, 1,465.08 and 399.20 is: 598.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.72 : 1,465.08 = 399.20 : x
  2. Step 2: Convert to fraction form
    976.72/1,465.08 = 399.20/x
  3. Step 3: Cross multiply
    976.72x = 1,465.08 × 399.20
  4. Step 4: Simplify right side
    976.72x = 584,859.94
  5. Step 5: Solve for x
    x = 584,859.94/976.72
  6. Step 6: Final answer
    x = 598.80

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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.